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Assessing CMIP6 simulations of Arctic sea ice drift:Role of near-surface wind and surface ocean current in model performance

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Advances in Climate Change Research 2023年第5期14卷 691-706页

作者： Xue WANG Ran LU Shao-Yin WANG Run-Tong CHEN Zhuo-Qi CHEN Feng-Ming HUI Hua-Bing HUANG Xiao CHENG School of Geospatial Engineering and Science Sun Yat-sen Universityand Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China Key Laboratory of Comprehensive Observation of Polar Environment(Sun Yat-sen University) Ministry of EducationZhuhai 519082China

Sea ice drift is a critical parameter for understanding the rapid changes in Arctic sea ice.Since the release of the Coupled Model Intercomparison Project Phase 6(CMIP6),there has been a lack of quantitative analysis regarding CMIP6's simulation of Arctic sea ice drift.This study aims to assess the simulated Arctic sea ice drift from 1979 to 2014 by fifteen CMIP6 models against recent satellite retrievals,utilizing various quantitative indices.Additionally,the influence of near-surface wind and surface ocean current on model performance is further analyzed.The CMIP6 models capture several aspects of the observed Arctic sea ice drift climatology and variability.The seasonal patterns of sea ice drift speed in all models exhibit similarities with the observed data,and the models agree with the evaluation datasets,indicating that the seasonal evolution of sea ice drift corresponds to near-surface wind patterns.However,notable discrepancies are identified.All models overestimate sea ice drift speed,exceeding the observational data by 36%e97%.Fourteen out of fifteen models display larger seasonal variability(ranging from 0.74 to 1.28 km d^(-1))compared to the observed data(0.54 km d^(-1)).Seven out of fifteen models exhibit a significant increasing trend in annual sea ice drift speed,similar to the observed trend of 0.58 km d^(-1) per decade,but with weaker trends(ranging from 0.11 to 0.33 km d^(-1) per decade).The remaining eight models reveal no statistically significant trend.The potential causes of such biases were further explored in this study.It suggests that the overestimation of sea ice drift speed in the models might be primarily attributed to the overestimation of near-surface wind speeds and their influence on sea ice drift speed.The models'overestimation of seasonal variability in near-surface wind speeds may account for the overestimation of seasonal variability in sea ice drift.The models'inability to represent the trend in sea ice drift speed may result from their failure to simulate an increasing trend

关键词： Arctic sea ice drift CMIP6 Model evaluation near-surface wind surface ocean current

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Observation and Simulation of near-surface wind and Its Variation with Topography in Urumqi,West China

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Journal of Meteorological Research 2016年第6期30卷 961-982页

作者：金莉莉李振杰何清缪启龙张虎强杨兴华 Institute of Desert Meteorology China Meteorological Administration Urumqi 830002 China Desert Atmosphere and Environment Observation Station at Taklimakan Tazhong 841000 China Lincang Meteorological Bureau of Yannan Province Lincang 677099 China College of Applied Meteorology Nanjing University of Information Science & Technology Nanjing 210044 China Bureau of Meteorology Melbourne VIC 3001 Australia

near-surface wind measurements obtained with five 100-m meteorology towers, 39 regional automatic stations, and simulations by the Weather Research and Forecasting （WRF） model were used to investigate the spatial structure of topography-driven flows in the complex urban terrain of Urumqi, China. The results showed that the wind directions were mainly northerly and southerly within the reach of 100 m above ground in the southern suburbs, urban area, and northern suburbs, which were consistent with the form of the Urumqi gorge. Strong winds were observed in southern suburbs, whereas the winds in the urban, northern suburbs, and northern rural areas were weak. Static wind occurred more frequently in the urban and northern rural areas than in the southern suburbs. In the southern suburbs, wind speed was relatively high throughout the year and did not show significant seasonal variations. The average annual wind speed in this region varied among 1.9-5.5, 1.1-3.6, 1.2 4.3, 1.2 4.3, and 1.1 3.5 m s-1 within the reach of 100 m above ground at Yannanlijiao, Shuitashan, Liyushan, Hongguangshan, and Midong, respectively. The flow characteristics comprised more airflows around the mountain, where the convergence and divergence were dominated by the terrain in eastern and southwestern Urumqi. Further analysis showed that there was a significant mountain-valley wind in spring, summer, and autumn, which occurred more frequently in spring and summer for 10- 11 h in urban and northern suburbs. During daytime, there was a northerly valley wind, whereas at night there was a southerly mountain wind. The conversion time from the mountain wind to the valley wind was during 0800-1000 LST （Local Standard Time）, while the conversion from the valley wind to the mountain wind was during 1900- 2100 LST. The influence of the mountain-valley wind in Urumqi City was most obvious at 850 hPa, according to the WRF model.

关键词： mountain-valley wind near-surface wind simulation topography Urumqi

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Aeolian dust transportation and deposition by near-surface winds in arid and semiarid China

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Research in Cold and Arid Regions 2010年第2期2卷 137-142页

作者： JinChang Li ZhiBao Dong GuangQiang Qian WanYin Luo Institute of Loess Plateau Shanxi UniversityTaiyuanShanxi 030006China Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of ScienceLanzhouGansu 730000China

Dustfall collections were carried out in April and May 2001 and in March 2002 at six sites in northern China.Our results showed that the total deposition of dust fractions <250 μm in diameter and the deposition of Fe... 详细信息

Dustfall collections were carried out in April and May 2001 and in March 2002 at six sites in northern China.Our results showed that the total deposition of dust fractions near-surface winds (<3 km above the ground).The Fe in aeolian dust generated from arid and semiarid regions of China and deposited in the North Pacific region is usually transported by the upper westerlies.

关键词： dust deposition half-attenuation distance near-surface wind arid and semiarid regions of China

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