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CHANG Liang,GUO Lixin,FENG Guiping,WU Xuerui,GAO Guoping,ZHANG Yang,ZHANG Yu. 2018. Comparison of the Arctic upper-air temperatures from radiosonde and radio occultation observations. Acta Oceanologica Sinica, 37(1):30－39

Comparison of the Arctic upper-air temperatures from radiosonde and radio occultation observations

基于无线电探空和无线电掩星观测的北极上层气温研究

Received:November 15, 2016

DOI：10.1007/s13131-018-1156-x

Key words:Arctic temperature radio occultation radiosonde

中文关键词: 北极气温无线电掩星无线电探空

基金项目:

Author Name	Affiliation	E-mail
CHANG Liang	College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China Collaborative Innovation Center for Distant-water Fisheries, Shanghai 201306, China
GUO Lixin	College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China Collaborative Innovation Center for Distant-water Fisheries, Shanghai 201306, China
FENG Guiping	College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China Collaborative Innovation Center for Distant-water Fisheries, Shanghai 201306, China
WU Xuerui	Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China Key Laboratory of Planetary Sciences, Chinese Academy of Sciences, Shanghai 200030, China
GAO Guoping	College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China Collaborative Innovation Center for Distant-water Fisheries, Shanghai 201306, China	gpgao@shou.edu.cn
ZHANG Yang	State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
ZHANG Yu	College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China Collaborative Innovation Center for Distant-water Fisheries, Shanghai 201306, China

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Abstract:

The air temperature is one of the most important parameters used for monitoring the Arctic climate change. The constellation observing system for meteorology, ionosphere, and climate and Formosa Satellite Mission 3 (COSMIC/FORMOSAT-3) radio occultation (RO) “wet” temperature product (i.e., “wetPrf”) is used to analyze the Arctic air temperature profiles at 925-200 hPa in 2007-2012. The “wet” temperatures are further compared with radiosonde (RS) observations. The results from the spatially and temporally synchronized RS and COSMIC observations show that their temperatures agree well with each other, especially at 400 hPa. Comparisons of seasonal temperatures and anomalies from the COSMIC and homogenized RS observations suggest that the limited number of COSMIC observations during the spatial matchup may be insufficient to describe the small-scale spatial structure of temperature variations. Furthermore, comparisons of the seasonal temperature anomalies from the RS and 5°×5° gridded COSMIC observations at 400 hPa during the sea ice minimum (SIM) of 2007 and 2012 are also made. The results reveal that similar Arctic temperature variation patterns can be obtained from both RS and COSMIC observations over the land area, while extra information can be further provided from the densely distributed COSMIC observations. Therefore, despite COSMIC observations being unsuitable to describe the Arctic temperatures in the lowest level, they provide a complementary data source to study the Arctic upper-air temperature variations and related climate change.

中文摘要:

大气温度是研究北极气候变化的最重要参数之一。本文基于COSMIC/FORMOSAT-3 (The Constellation Observing System for Meteorology, Ionosphere, and Climate and Formosa Satellite mission 3)卫星平台的无线电掩星(RO)“湿”大气温度产品，分析了2007-2012年北极925-200 hPa的大气温度廓线变化。RO与无线电探空（RS）观测到的“湿”温度比较分析后的结果表明，时空同步的RS与COSMIC观测得到的温度在400hPa处符合的最好。利用COSMIC和均一化的RS资料进行北极气温和气温异常的分析表明，低空间分辨率的COSMIC观测资料难以准确估计北极气温的小尺度变化。此外，本文通过分析比较RS和5°×5°网格化的COSMIC温度产品在2007和2012年这2个北极海冰极小值（SIM）典型年份在400hPa的季节性温度异常后发现，大范围COSMIC观测比RS观测能更精确地反馈北极气温变化规律。通过本文研究发现，尽管COSMIC掩星观测难以精确直接给出北极大气底层的温度，但其可以精确估计北极上层气温并揭示其变化规律，可为北极气候变化研究提供重要依据。

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