| Li Na,Li Bingrui,Lei Ruibo,Li Qun. 2020. Comparison of summer Arctic sea ice surface temperatures from in situ and MODIS measurements. Acta Oceanologica Sinica, 39(9):18－24 |
| Comparison of summer Arctic sea ice surface temperatures from in situ and MODIS measurements |
| 夏季北极海冰表皮温度实测资料与MODIS产品的对比分析 |
| Received:October 26, 2019 |
| DOI：10.1007/s13131-020-1644-7 |
| Key words:sea ice surface temperature thermal radiometer MODIS Arctic Ocean |
| 中文关键词: 冰表皮温度 红外辐射计 MODIS 北冰洋 |
| 基金项目:The National Natural Science Foundation of China under contract No. 41606222; the National Key Research and Development Project under contract No. 2016YFC1400303. |
| Author Name | Affiliation | E-mail | | Li Na | Polar Research Institute of China, Shanghai 200136, China
MNR Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai 200136, China | lina@pric.org.cn | | Li Bingrui | Polar Research Institute of China, Shanghai 200136, China
MNR Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai 200136, China | | | Lei Ruibo | Polar Research Institute of China, Shanghai 200136, China
MNR Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai 200136, China | | | Li Qun | Polar Research Institute of China, Shanghai 200136, China
MNR Key Laboratory for Polar Science, Polar Research Institute of China, Shanghai 200136, China | |
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| Abstract: |
| Ship-borne infrared radiometric measurements conducted during the Chinese National Arctic Research Expedition (CHINARE) in 2008, 2010, 2012, 2014, 2016 and 2017 were used for in situ validation studies of the Moderate Resolution Imaging Spectroradiometer (MODIS) sea ice surface temperature (IST) product. Observations of sea ice were made using a KT19.85 radiometer mounted on the Chinese icebreaker Xuelong between July and September over six years. The MODIS-derived ISTs from the satellites, Terra and Aqua, both show close correspondence with ISTs derived from radiometer spot measurements averaged over areas of 4 km×4 km, spanning the temperature range of 262–280 K with a ±1.7 K (Aqua) and ±1.6 K (Terra) variation. The consistency of the results over each year indicates that MODIS provides a suitable platform for remotely deriving surface temperature data when the sky is clear. Investigation into factors that cause the MODIS IST bias (defined as the difference between MODIS and KT19.85 ISTs) shows that large positive bias is caused by increased coverage of leads and melt ponds, while large negative bias mostly arises from undetected clouds. Thin vapor fog forming over Arctic sea ice may explain the cold bias when cloud cover is below 20%. |
| 中文摘要: |
| 2008年、2010年、2012年、2014年、2016年与2017年中国北极科学考察期间，利用船载红外辐射计KT19.85的数据，我们获取了6个夏季航次的海冰表皮温度数据。与4km MODIS全球海冰表皮温度产品的对比分析显示，在262-280K范围内，两颗卫星Aqua与Terra的MODIS海冰表皮温度产品与红外辐射计数据平均偏差（MODIS-KT19.85）为-1.6K（Aqua）与-2.2K（Terra），所对应标准偏差为1.7 K与1.6K，且在各航次均具有较好的一致性。对误差来源的分析表明，夏季复杂的海冰表面特征不会对整体偏差造成较大的影响，随水道与融池覆盖面积的增加，密集冰区的MODIS海冰表皮温度会高于实测值，形成正偏差；未检测出的云是负偏差形成的主要原因，当云量低于20%时，此冷偏差可能是由夏季北极海冰上形成的蒸汽雾所产生的。 |
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