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On the Shallowing of Antarctic Low-Level Temperature Inversions Projected by CESM-LE under RCP8.5

Journal of Meteorological Research 2024年第3期38卷 586-599页

作者： Minghu DING Lin ZHANG tingfeng dou Yi HUANG Yingyan LUO Junmei LYU Cunde XIAO State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesChina Meteorological AdministrationBeijing100081China Key Laboratory of Meteorology and Ecological Environment of Hebei Province Hebei Provincial Institute of Meteorological SciencesShijiazhuang050021China College of Resources and Environment University of Chinese Academy of SciencesBeijing100049China State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing100875China

Temperature inversions are frequently observed in the boundary layer and lower troposphere of polar *** variations of the low-level temperature inversions in these regions,especially the Antarctic,are still poorly *** to the scarcity of observations in the Antarctic,reanalysis data and numerical simulations are often used in the study of Antarctic climate *** on ERA-Interim,ERA5,JRA-55,and NCEP-NCAR reanalysis products,this study examines temporal and spatial variations of Antarctic inversion depth in austral autumn and winter during *** inversions are found to occur over the high plateau areas of the Antarctic *** on the Mann-Kendall test,ERA-Interim and ERA5 data reveal that the Antarctic inversion depth in austral autumn and winter increased during 1992-2007,roughly maintained afterwards,and then significantly decreased since around *** decrease trend is more obvious in the last two months of ***,JRA-55 better represents the spatial distribution of inversion depth,and ERA-Interim has better interannual *** Community Earth System Model Large Ensemble(CESM-LE)30-member simulations in 1979-2005 were first verified against JRA-55,showing reasonable consistency,and were then used to project the future changes of Antarctic low-level inversion depth over 2031-2050 under *** CESM-LE projection results reveal that the temperature inversion will shallow in the Antarctic at the end of the 21st century,and the decrease in depth in autumn will be more pronounced than that in *** particular,the temperature inversion will weaken over the ice-free ocean,while it will remain stable over the ice sheet,showing certain spatial heterogeneity and seasonal dependence on the underlying cryospheric surface *** addition,the decrease of inversion depth is found closely linked with the reduction in sea ice,suggesting the strong effect of global warming on the thermal structure change o

关键词： boundary layer temperature inversion Antarctic climate change Community Earth System Model Large Ensemble(CESM-LE)

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A Preliminary Investigation of Arctic Sea Ice Negative Freeboard from in-situ Observations and Radar Altimetry

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Journal of Ocean University of China 2021年第2期20卷 307-314页

作者： LI Shutong dou tingfeng XIAO Cunde State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Land Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China

The negative freeboard of sea ice(i.e., the height of ice surface below sea level) with subsequent flooding is widespread in the Southern Ocean, as opposed to the Arctic, due to the relatively thicker ice and thinner snow. In this study, we used the observations of snow and ice thickness from 103 ice mass balance buoys(IMBs) and NASA Operation IceBridge Aircraft Missions to investigate the spatial distribution of negative freeboard of Arctic sea ice. The Result showed that seven IMBs recorded negative freeboards, which were sporadically located in the seas around Northeast Greenland, the Central Arctic Ocean, and the marginal areas of the Chukchi–Beaufort Sea. The observed maximum values of negative freeboard could reach-0.12 m in the seas around Northeast Greenland. The observations from IceBridge campaigns also revealed negative freeboard comparable to those of IMBs in the seas around North Greenland and the Beaufort Sea. We further investigated the large-scale distribution of negative freeboard using NASA CryoSat-2 radar altimeter data, and the result indicates that except for the negative freeboard areas observed by IMBs and IceBridge, there are negative freeboards in other marginal seas of the Arctic Ocean. However, the comparison of the satellite data with the IMB data and IceBridge data shows that the Cryosat-2 data generally overestimate the extent and magnitude of the negative freeboard in the Arctic.

关键词： Arctic sea ice negative freeboard ice mass balance buoy IceBridge CryoSat-2

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Reconstruction of autumn sea ice extent changes since AD1289 in the Barents-Kara Sea, Arctic

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Science China Earth Sciences 2018年第9期61卷 1279-1291页

作者： Qi ZHANG Cunde XIAO Minghu DING tingfeng dou Institute of Polar Meteorology Chinese Academy of Meteorological Sciences State Key Laboratory of Earth Surface and Resources Ecology Beijing Normal University College of Resources and Environment University of Chinese Academy of Sciences

Using high-resolution ice core and tree ring proxies for sea ice extent （SIE）, we reconstructed a robust time series of autumn SIE over the Barents-Kara （B-K） sector of the Arctic from AD 1289-1993. After intercomparing the results and statistical parameters using the ordinary least squares regression （OLSR）, the principle component regression （PCR） and the partial least squares regression （PLSR） methods, SIE time series were synthesized into a more robust series using the weighted average method, which used the explained variances as weights. The results showed that from the end of the 13th century to the end of 18th century, the autumn B-K SIE was large, with large variations and a slightly expanding trend overall. This reflected significant multideeadal oscillations under the Little Ice Age （LIA） background. The B-K SIE began to decrease at the end of the 18th century, and a shrinking trend became significant during the second half of the 19th century, which lasted into the 1930s- 1940s. The 1930s-1940s was a period with a relatively low SIE in the B-K Sea, and the SIE had a short period of expansion from the 1940s-1970s. However, the B-K SIE has continuously and significantly shrank since the 1970s. The reduction in the B-K SIE since the end of the 18th century has been unprecedented in both duration and speed over the last 700 years. The B-K SIE has retreated significantly since the 1970s, with a speed 6.18 times greater than the former mean retreating speed. The industrial revolution may be a dominant factor in this result. The Arctic SIE in recent years may be the lowest it has been over the last millennium.

关键词： Arctic Sea ice Ice core Tree rings Paleoclimatology Global warming

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Changes in the Proportion of Precipitation Occurring as Rain in Northern Canada during Spring–Summer from 1979–2015

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Advances in Atmospheric Sciences 2018年第9期35卷 1129-1136页

作者： Wei HAN Cunde XIAO tingfeng dou Minghu DING Nanjing University of Information Science and Technology Nanjing 210044China Institute of Polar Meteorology Chinese Academy of Meteorological SciencesBeijing 100081China State Key Laboratory of Earth Surface and Resource Ecology Beijing Normal UniversityBeijing 100875China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

Changes in the form of precipitation have a considerable impact on the Arctic cryosphere and ecological system by influencing the energy balance and surface runoff. In this study, station observations and ERA-Interim data were used to analyze changes in the rainfall to precipitation ratio（RPR） in northern Canada during the spring–summer season（March–July）from 1979–2015. Our results indicate that ERA-Interim describes the spring–summer variations and trends in temperature and the RPR well. Both the spring–summer mean temperature [0.4℃–1℃（10 yr）^（-1）] and the RPR [2%–6%（10 yr）^（-1）] increased significantly in the Canadian Arctic Archipelago from 1979–2015. Moreover, we suggest that, aside from the contribution of climate warming, the North Atlantic Oscillation is probably another key factor influencing temporal and spatial differences in the RPR over northern Canada.

关键词： climate change rainfall to precipitation ratio northern Canada North Atlantic Oscillation

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Measurements of physical characteristics of summer snow cover on sea ice during the Third Chinese Arctic Expedition

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Research in Cold and Arid Regions 2013年第3期5卷 309-315页

作者： tingfeng dou CunDe Xiao College of Resources and Environment University of Chinese Academy of Sciences State Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Institute of Climate System Chinese Academy of Meteorological Sciences

The spatial distribution of snow cover on the central Arctic sea ice is investigated here based on the observations made during the Third Chinese Arctic Expedition. Six types of snow were observed during the expedition： new/recent snow, melt-fi＇eeze crust, icy layer, depth hoar, coarse-grained, and chains of depth hoar. Across most measurement areas, the snow surface was covered by a melt-freeze crust 2-3 cm thick, which was produced by alternate strong solar radiation and the sharp temperature decrease over the summer Arctic Ocean. There was an intermittent layer of snow and ice at the base of the snow pack. The mean bulk density of the snow was 304.01~29.00 kg/m3 along the expedition line, and the surface values were generally smaller than those of the sub- surface, confirming the principle of snow densification. In addition, the thicknesses and water equivalents of the new/recent and total-layer snow showed a decreasing trend with latitude, suggesting that the amount of snow cover and its spatial variations were mainly determined by precipitation. Snow temperature also presented significant variations in the vertical profile, and ablation and evaporation were not the primary factors in the snow assessment in late summer. The mean temperature of the surface snow was -2.01±0.96℃, which was much higher than that observed in the interface of snow and sea ice.

关键词： Arctic sea ice snow cover snow water equivalent the Third Chinese Arctic Expedition

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A Statistical Linkage between Extreme Cold Wave Events in Southern China and Sea Ice Extent in the Barents-Kara Seas from 1289 to 2017

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Advances in Atmospheric Sciences 2023年第12期40卷 2154-2168页

作者： Cunde XIAO Qi ZHANG Jiao YANG Zhiheng DU Minghu DING tingfeng dou Binhe LUO State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

Arctic sea ice loss and the associated enhanced warming has been related to midlatitude weather and climate changes through modulate meridional temperature gradients linked to circulation. However, contrasting lines of evidence result in low confidence in the influence of Arctic warming on midlatitude climate. This study examines the additional perspectives that palaeoclimate evidence provides on the decadal relationship between autumn sea ice extent (SIE) in the Barents-Kara (B-K) Seas and extreme cold wave events (ECWEs) in southern China. Reconstruction of the winter Cold Index and SIE in the B-K Seas from 1289 to 2017 shows that a significant anti-phase relationship occurred during most periods of decreasing SIE, indicating that cold winters are more likely in low SIE years due to the “bridge” role of the North Atlantic Oscillation and Siberian High. It is confirmed that the recent increase in ECWEs in southern China is closely related to the sea ice decline in the B-K Seas. However, our results show that the linkage is unstable, especially in high SIE periods, and it is probably modulated by atmospheric internal variability.

关键词： extreme cold wave events sea ice Barents-Kara(B-K)Seas Arctic southern China

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Spatial variability ofδ^(18)O andδ^(2)H in North Pacific and Arctic Oceans surface seawater

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Advances in Polar Science 2022年第3期33卷 244-252页

作者： LI Zhiqiang DING Minghu WANG Yetang DU Zhiheng dou tingfeng National Marine Environmental Forecasting Center Beijing 100081China State Key Laboratory of Severe Weather and Institute of Tibetan Plateau&Polar Meteorology Chinese Academy of Meteorological SciencesBeijing 100081China State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China College of Geography and Environment Shandong Normal UniversityJinan 250014China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

This study presents new observations of stable isotopic composition(δ^(18)O,δ^(2)H and deuterium excess)in surface waters of the North Pacific and Arctic Oceans that were collected during the sixth Chinese National Arctic Research Expedition(CHINARE)from mid-summer to early autumn ***δ^(18)O andδ^(2)H decrease with increasing latitudes from 39°N to 75°N,likely a result of spatial variability in evaporation/precipitation *** explanation is further confirmed by comparing theδ^(18)O-δ^(2)H relationship of seawater with that of ***,effects of freshwater inputs on seawater stable isotopic composition are also identified at 30°N-39°***,we find a non-significant relationship between the isotopic parameters(δ^(2)H andδ^(18)О)and salinity from 73°N northwards in the Arctic Ocean,implying that sea ice melting/formation may have some *** results suggest that the isotopic parametersδ^(2)H andδ^(18)Оare useful for tracing marine hydrological processes.

关键词： stable water isotopes seawater salinity surface seawater North Pacific Ocean Arctic Ocean

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An observational study of precipitation types in the Alaskan Arctic

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Advances in Polar Science 2021年第4期32卷 327-340页

作者： YUE Handong dou tingfeng LI Shutong LI Chuanjin DING Minghu XIAO Cunde College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China State Key Laboratory of Severe Weather and Institute of Tibetan Plateau&Polar Meteorology Chinese Academy of Meteorological SciencesBeijing 100081China State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China

The effects of various precipitation types,such as snow,rain,sleet,hail and freezing rain,on regional hydrology,ecology,snow and ice surfaces differ *** to limited observations,however,few studies into precipitation types have been conducted in the *** on the high-resolution precipitation records from an OTT Parsivel^(2) disdrometer in Utqiaġvik,Alaska,this study analysed variations in precipitation types in the Alaskan Arctic from 15 May to 16 October,*** show that rain and snow were the dominant precipitation types during the measurement period,accounting for 92%of the total *** addition,freezing rain,sleet,and hail were also observed(2,4 and 11 times,respectively),accounting for the rest part of the total *** records from a neighbouring *** Reference Network(USCRN)station equipped with T-200B rain gauges support the results of *** analysis revealed that Global Precipitation Measurement(GPM)satellite data could well characterise the observed precipitation changes in Utqiaġ*** with satellite data and station observations,the spatiotemporal variations in precipitation were verified in various reanalysis datasets,and the results indicated that ECMWF Reanalysis v5(ERA5)could better describe the observed precipitation time series in Utqiaġvik and the spatial distribution of data in the Alaskan ***-Era Retrospective analysis for Research and Applications,Version 2(MERRA-2)overestimated the amount and frequency of *** 55-year Reanalysis(JRA-55)could better simulate heavy precipitation events and the spatial distribution of the precipitation phase,but it overestimated summer snowfall.

关键词： disdrometer precipitation types reanalysis datasets data comparison

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Sources, evolution and impacts of EC and OC in snow on sea ice： a measurement study in Barrow, Alaska

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Science Bulletin 2017年第22期62卷 1547-1554页

作者： tingfeng dou Cunde Xiao Zhiheng Du J. J. Schauer Hong Ren Baozhu Ge Aihong Xie Jihua Tan Pingqing Fu Yuanxun Zhang College of Resources and Environment University of Chinese Academy of Sdences Beijing 100049 China State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou 730000 China State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal University Beijing 100875 China Environmental Chemistry and Technology Program University of Wisconsin-Madison Madison Wl 53706 USA state Key Laboratory of Atmospheric Boundary Layer Physics-an-d Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Huairou Eco-Environmental Observatory Chinese Academy of Sciences Beijing 101408 China Institute of Surface-Earth System Science Tianjin University Tianjin 300072 China

Based on the field measurements in Barrow, Alaska within the period of April-May 2015, we investigate the sources and variations of elemental carbon(EC) and organic carbon(OC) in the surface layer of snowpack on sea ice, and estimate their effects on the sea ice albedo. Results show that the snow OC in Barrow are from natural sources(e.g. terrestrial higher plants and micro-organisms) mainly, as well as biomass burning(e.g. forest fires and straw combustion) as an important part. Both EC and OC can accumulate at the snow surface with snow melt. The variations in EC and OC and liquid water content in the snow layer are well consistent during the snow-melting period. A higher rate of snow melt implied a more efficient enrichment of EC and OC. In the last phase of snow melt, the concentration increased to a maximum of 16.2 ng/g for EC and 128 ng/g for OC, which is ~10 times larger than those before snow melt onset. Except for the dominant influence of melt amplification mechanism, the variation in concentrations of EC and OC could be disturbed by the air temperature fluctuation and snowfall. Our study indicates that the lightabsorbing impurities contributed 1.6%-5.1% to the reduction in sea ice albedo with melt during the measurement period. The significant period oflight-absorbing impurities influencing on sea ice albedo begins with the rapid melting of overlying snow and ends before the melt ponds formed widely, which lasted for about 10 days in Barrow, 2015.

关键词： Arctic EC OC Sea ice Albedo Barrow

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南半球降水对南极海冰涛动异常的响应

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极地研究 2013年第1期25卷 45-52页

作者：窦挺峰效存德中国科学院大学资源与环境学院北京100049 中国科学院寒区旱区环境与工程研究所冰冻圈国家重点实验室甘肃兰州730000 中国气象科学研究院气候系统研究所北京100081

运用NCAR/CAM3全球大气环流模式,结合气候学诊断方法,分析了南极海冰涛动异常对南半球降水的影响,并对可能的作用机理进行了初步探讨。结果表明,南半球中纬度降水对海冰涛动异常的响应较为显著,且异常响应的空间分布与海冰涛动类似,分... 详细信息

运用NCAR/CAM3全球大气环流模式,结合气候学诊断方法,分析了南极海冰涛动异常对南半球降水的影响,并对可能的作用机理进行了初步探讨。结果表明,南半球中纬度降水对海冰涛动异常的响应较为显著,且异常响应的空间分布与海冰涛动类似,分别在南美洲大陆以东大西洋和以西太平洋的广阔海域上存在两个正负值中心。数值模拟结果显示,海冰涛动异常可以通过改变地表热通量,影响对流层中层大气,进而驱动费莱尔环流的上升支,加强或减弱费莱尔环流的强度,最终对南半球中纬度地区的降水分布产生影响。在阿蒙森/别林斯高晋海外围海冰异常偏少的海域,向上的热通量增加,局地加热会使得费莱尔环流的上升支异常偏强,费莱尔环流的经向输送增强,对应其在中低纬的下沉支也偏强,局地下沉气流异常偏强则会抑制降水的生成,导致降水异常偏少。在威德尔海外围海冰异常偏多的海域,经向环流和降水的响应几乎相反,但因受西南极半岛和南美洲陆面作用的影响,对应经度带费莱尔环流对海冰异常的响应较弱。

关键词：南极海冰涛动费莱尔环流降水异常

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