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greenland ice sheet Elevation Change in Winter and Influence of Atmospheric Teleconnections in the Northern Hemisphere

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Atmospheric and Oceanic Science Letters 2009年第6期2卷 376-380页

作者： CHEN Lin-Ling Ola M. JOHANNESSEN Kirill KHVOROSTOVSKY WANG Hui-Jun Nansen-Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Climate Change Research Center Institute of A tmospherie Physics Chinese Academy of Sciences Beijing 100029 China Nansen Environmental and Remote Sensing Center Bergen 5006 Norway Nansen Scientific Society Bergen 5006 Norway

The relationship between the variability of the surface elevation of the greenland ice sheet (GIS) in winter and sea level pressure is identified through analysis of data from satellite-borne radar altimeters, together with meteorological data fields during 1993 2005. We found that both the North Pacific Oscillation (NPO) and the North Atlantic Oscillation (NAO), the two major teleconnection patterns of the atmospheric surface pressure fields in the Northern Hemisphere, significantly influence the GIS winter elevation change. Further, it is suggested that the NPO may affect the GIS accumulation by influencing the NAO, particularly by changing the intensity and location of the icelandic Low.

关键词： greenland ice sheet North Pacific Oscillation North Atlantic Oscillation atmospheric teleconnection patterns

Accumulation over the greenland ice sheet as Represented in Reanalysis Data

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Advances in Atmospheric Sciences 2011年第5期28卷 1030-1038页

作者：陈琳玲 Ola M.JOHANNESSEN 王会军 Atsumu OHMURA Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of Sciences Beijing 100029 Mohn-Sverdrup Center Nansen Environmental and Remote Sensing Center Bergen 5006 Norway Nansen Scientific Society Bergen 5006 Norway Mohn-Sverdrup Center Nansen Environmental and Remote Sensing CenterBergen 5006Norway Nansen Scientific Society Bergen 5006Norway Institute for Atmospheric and Climate Science Swiss Federal Institute of Technology(ETH)Zrich 8092Switzerland

Annual precipitation,evaporation,and calculated accumulation from reanalysis model outputs have been investigated for the greenland ice sheet （GrIS）,based on the common period of *** ERA-40 and ERA-interim reanalysis data showed better agreement with observations than do NCEP-1 and NCEP-2 ***,ERA-interim showed the closest spatial distribution of accumulation to the *** temporal variations,ERA-interim showed the best correlation with precipitation observations at five synoptic stations,and the best correlation with in situ measurements of accumulation at nine ice core *** mean annual precipitation averaged over the whole GrIS from ERA-interim （363 mm yr 1） and mean annual accumulation （319 mm yr 1） are very close to the *** validation of accumulation calculated from reanalysis data against ice-core measurements suggests that further improvements to reanalysis models are needed.

关键词： greenland ice sheet reanalysis data precipitation accumulation

An elevation change dataset in greenland ice sheet from 2003 to 2020 using satellite altimetry data

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Big Earth Data 2024年第2期8卷 231-248页

作者： Bojin Yang Shuang Liang Huabing Huang Xinwu Li Key Laboratory of Digital Earth Science Aerospace Information Research InstituteChinese Academy of SciencesBeijingChina International Research Center of Big Data for Sustainable Development Goals BeijingChina University of Chinese Academy of Sciences BeijingChina School of Geospatial Engineering and Science Sun Yat-Sen UniversityGuangzhouChina Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) ZhuhaiChina

ABSTRACT A decade-long pronounced increase in temperatures in the Arctic resulted in a global warming hotspot over the greenland ice sheet(GrIS).Associated changes in the cryosphere were the consequence and led to a demand for monitoring glacier changes,which are one of the major parameters to analyze the responses of the GrIS to climate ***-term altimetry data(***,CryoSat-2,and iceSat-2)can provide elevation changes over different periods,and many methods have been developed for altimetry alone to obtain elevation *** this work,we provided the long-term elevation change rate data of the GrIS in three different periods using iceSat data(from February 2003 to October 2009),Cryosat-2 data(from August 2010 to October 2018)and iceSat-2 data(from October 2018 to December 2020).Optimal methods were applied to the datasets collected by three different altimeters:crossover analysis for iceSat/iceSat-2 and the surface fit method for *** data revealed that the elevation change rates of the GrIS were-12.19±3.81 cm/yr,-19.70±3.61 cm/yr and-23.39±3.06 cm/yr in the three different periods,corresponding to volume change rates of-210.20±25.34 km^(3)/yr,-339.11±24.01 km^(3)/yr and-363.33±20.37 km^(3)/yr,*** general,the obtained results agree with the trends discovered by other studies that were also derived from satellite altimetry *** dataset provides the basic data for research into the impact of climate change over the *** dataset is available at https://***/10.57760/sciencedb.j00076.00121.

关键词： greenland ice sheet elevation change volume change satellite altimetry

Analysis of the record-breaking August 2021 rainfall over the greenland ice sheet

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Advances in Polar Science 2023年第3期34卷 165-176页

作者： DOU Tingfeng XIE Zuowei Jason E.BOX YANG Qing YANG Yifan TENG Shiwen XU Gaojie LIU Chao LI Xichen Derek HOUTZ GONG Xun DU Zhiheng DING Minghu YU Yongqiang XIAO Cunde College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China Geological Survey of Denmark and greenland(GEUS) Copenhagen 1350Denmark Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration School of Atmospheric PhysicsNanjing University of Information Science&TechnologyNanjing 210044China Swiss Federal Institute for Forest Snow and Landscape Research(WSL)Birmensdorf CH-8903Switzerland Hubei Key Laboratory of Marine Geological Resources China University of GeosciencesWuhan 430074China State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Institute of Global Change and Polar Meteorology Chinese Academy of Meteorological SciencesBeijing 100081China State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China

Rainfall was witnessed for the first time at the highest area of the greenland ice sheet on 14 August,*** thermodynamic mechanisms supporting the rainfall are revealed by ERA5 reanalysis,in-situ and satellite *** find that a strong southward intrusion of the polar vortex favored the maintenance of a deep cyclone over Baffin Island and an amplification of anticyclonic circulation over the southeastern ice sheet,which pumped warm and moist air toward greenland from anomalously warm waters south of *** a wide swath of the ice sheet,atmospheric uplift maintained above-melting and rainfall conditions via condensation and enhanced downward infrared *** the low-level liquid clouds,the spatial extent and duration of the rainfall would have been *** the ice sheet topographic summit,the air temperature from the ground to 250 hPa level was~2℃higher than the previous record set on 12 July,*** events may occur more frequently with the decreased temperature contrast between the Arctic and the mid-latitude regions that drives highly amplified jet ***,this extreme event serves as a harbinger of a more likely wet surface condition across all elevations of the ice sheet.

关键词： greenland ice sheet rainfall polar vortex liquid cloud

Performance of surface radiation products of greenland ice sheet using in-situ measurements

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Advances in Polar Science 2023年第3期34卷 190-219页

作者： CHE Jiahang HUAI Baojuan SUN Weijun DING Minghu WANG Lei ZHANG Qinglin WU Jiake KANG Limin TENG Xinru YANG Xiaohong YAN Jinpei ZHAO Shuhui College of Geography and Environment Shandong Normal UniversityJinan 250358China State Key Laboratory of Severe Weather China Academy of Meteorological SciencesBeijing 100081China Key Laboratory of Global Change and Marine-Atmospheric Chemistry Third Institute of OceanographyMinistry of Natural ResourcesXiamen 361005China School of Tourism Taishan UniversityTaian 271021China

Radiation is the direct energy source of the surface natural environment and the main driving force of climate *** has increasingly become an important meteorological factor affecting the surface heat exchange and glacier mass balance,especially in the glacier changes of the greenland ice sheet(Gr IS).Due to the harsh climatic conditions of Gr IS and sparse observed data,it has become an important way to obtain radiation data from reanalysis ***,the applicability of these radiation data on Gr IS is uncertain and worth *** this work,we evaluate five reanalysis datasets(the fifth generation of European Centre for Medium-Range Weather Forecasts(ERA5),European Centre for Medium-Range Weather Forecasts Interim Reanalysis(ERA-Interim),Japanese 55-year Reanalysis(JRA55),National Centers for Environmental Prediction Reanalysis II(NCEP2)and Modern-Era Retrospective analysis for Research and Applications,Version 2(MERRA-2))during 1997-2022 using observations from 26 Program for Monitoring the greenland ice sheet(PROMice)automatic weather stations(AWSs)and 3 K-transect AWSs on Gr *** conclusions are as follows:ERA5 has the best performances in downward shortwave radiation(SWD)as well as downward and upward longwave radiation(LWD and LWU),but the performance is not the best in upward shortwave radiation(SWU).Based on the radiation budget analysis with ERA5 during 1979-2022,the fluctuation of longwave radiation is greater than that of shortwave *** seasonal variation of shortwave radiation is obvious,while that of longwave radiation is *** increasing trend of longwave radiation may result from global warming,in which ice sheets absorb more solar radiation and the surface heats up significantly,emitting more LWU.

关键词： greenland ice sheet downward shortwave radiation upward shortwave radiation downward longwave radiation upward longwave radiation reanalysis datasets automatic weather stations

Some recent advances in remote sensing-based monitoring of changes in the greenland ice sheet

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Advances in Polar Science 2024年第2期35卷 275-280页

作者： FENG Tiantian JIA Jinyu WANG Wei YU Zeran LIU Xingchen LI Guojun GU Yuanyuan LI Rongxing The Center for Spatial Information Science and Sustainable Development Applications Tongji UniversityShanghai 200092China College of Surveying and Geo-Informatics Tongji UniversityShanghai 200092China College of Electronic Science and Technology National University of Defense TechnologyChangsha 410073China

The mass balance of the greenland ice sheet(GrIS)plays a crucial role in global sea level *** the 1960s,remote sensing missions have been providing extensive and continuous observation data for change monitoring of the *** this paper,we present our recent research results from remote sensing-based GrIS change ***,historical satellite data are processed and used to fill data gaps and are combined with existing partial maps,completing an ice velocity map of the GrIS from the 1960s to *** map provides valuable data for estimating the historical mass balance of ***,the monthly gravimetry-based mass balance of the GrIS from 2002 to 2020 is estimated by combining Gravity Recovery and Climate Experiment(GRACE)and GRACE Follow On(GRACE-FO)*** is found that the GrIS has lost a total mass of approximately 4443±75 Gt during this ***,based on Global Land ice Measurements from Space(GLIMS),an updated greenland glacier inventory is achieved utilizing data collected between 2006 and *** inventory provides more detailed and up-to-data glacier boundaries of ***,these advances provide essential data support for estimating the mass balance of the GrIS,contributing to the advancement of research on global sea level change.

关键词： greenland ice sheet remote sensing change monitoring ice velocity satellite gravimetry glacier inventory

Evaluation of vertical crustal movements and sea level changes around greenland from GPS and tide gauge observations

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Acta Oceanologica Sinica 2021年第1期40卷 4-12页

作者： Jiachun An Baojun Zhang Songtao Ai Zemin Wang Yu Feng Chinese Antarctic Center of Surveying and Mapping Wuhan UniversityWuhan 430079China State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhan 430079China Department of Brewing Engineering Moutai InstituteRenhuai 564507China

To better monitor the vertical crustal movements and sea level changes around greenland,multiple data sources were used in this paper,including global positioning system(GPS),tide gauge,satellite gravimetry,satellite altimetry,glacial isostatic adjustment(GIA).First,the observations of more than 50 GPS stations from the international GNSS service(IGS)and greenland network(GNET)in 2007–2018 were processed and the common mode error(CME)was eliminated with using the principal component analysis(PCA).The results show that all GPS stations show an uplift trend and the stations in southern greenland have a higher vertical ***,by deducting the influence of GIA,the impact of current Gr IS mass changes on GPS stations was analysed,and the GIA-corrected vertical velocity of the GPS is in good agreement with the vertical velocity obtained by gravity recovery and climate experiment(GRACE).Third,the absolute sea level change around greenland at 4 gauge stations was obtained by combining relative sea level derived from tide gauge observations and crustal uplift rates derived from GPS observations,and was validated by sea level products of satellite *** results show that although the mass loss of Gr IS can cause considerable global sea level rise,eustatic movements along the coasts of greenland are quite complex under different mechanisms of sea level changes.

关键词： greenland ice sheet GPS vertical crustal movement tide gauge sea level change

Assessment of greenland surface melt algorithms based on DMSP and SMOS data

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Advances in Polar Science 2023年第3期34卷 177-189页

作者： LI Qian WANG Che ZHANG Tong CHENG Wei DING Minghu State Key Laboratory of Urban Environmental Processes and Digital Simulation Capital Normal UniversityBeijing 100048China State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China Beijing Institute of Applied Meteorology Beijing 100029China

Satellite-borne microwave radiometers provide essential measurements to study the surface melt state of ice sheets. Therefore, selecting suitable microwave radiometer data is critical to characterize the spatial distribution of surface melt. In this study, we investigated the greenland ice sheet and evaluated the usefulness, as climate indicators, of data acquired by microwave radiometers onboard the F17 satellite of the United States of America Defense Meteorological Satellite Program(DMSP) and the Soil Moisture and Ocean Salinity(SMOS) satellite of the European Space Agency. First, surface melt was simulated using the DMSP dataset as input for a brightness temperature threshold algorithm, the Microwave Emission Model of Layered Snowpacks(MEMLS2), and the SMOS dataset as input for the L-band Specific MEMLS(LS-MEMLS). For accuracy evaluation, the simulation results were then compared with surface melt estimates derived from air temperature measurements at Automatic Weather Stations and from ice surface temperature measurements from the Moderate Resolution Imaging Spectroradiometer(MODIS) satellite-borne instrument. Our results show that global(over greenland) MEMLS2 simulation performance(overall accuracy 83%) was higher than that of LS-MEMLS(overall accuracy 78%). However, in southeastern greenland, MEMLS2 omission error was markedly higher than that of LS-MEMLS, whereas LS-MEMLS could detect longer-lasting surface melt than MEMLS2. This analysis showed that DMSP-based surface melt simulations are more accurate than SMOS-based simulations, thereby providing a data selection reference for surface melt studies of the greenland ice sheet.

关键词： greenland ice sheet surface melt microwave radiometer MEMLS2 LS-MEMLS

Vibrocorer for undisturbed sampling of firn aquifer layers in greenland: general concept

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Advances in Polar Science 2023年第3期34卷 232-235页

作者： Pavel TALALAY XIAN Tao FAN Xiaopeng LI Bing LI Yazhou GONG Da Polar Research Center Jilin UniversityChangchun 130000China China University of Geosciences(Beijing) Beijing 100083China

The firn aquifer beneath the greenland ice sheet may play a significant role in rising sea level. Both traditional mechanical drilling and electric thermal drilling are poorly adapted for effective, low-disturbance sampling in firn aquifers. We propose using a vibrocoring technique for the undisturbed sampling of dry firn and firn aquifer layers. A remote-controlled vibrocorer is designed to obtain 1-m-long cores with a diameter of 100 mm. The depth capacity of the system is approximately 50 m. The total weight of the vibrocoring system with the surface auxiliary equipment is approximately 110 kg, and corer assembly itself weighs ~60 kg.

关键词： greenland ice sheet undisturbed sampling vibrocoring firn aquifer