气候变化领域集成服务门户(CCPortal): Near-surface temperature inversion during summer at Summit, Greenland, and its relation to MODIS-derived surface temperatures

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DOI	10.5194/tc-12-907-2018
	Near-surface temperature inversion during summer at Summit, Greenland, and its relation to MODIS-derived surface temperatures
	Adolph A.C.; Albert M.R.; Hall D.K.
发表日期	2018
ISSN	19940416
卷号	12 期号:3
英文摘要	As rapid warming of the Arctic occurs, it is imperative that climate indicators such as temperature be monitored over large areas to understand and predict the effects of climate changes. Temperatures are traditionally tracked using in situ 2 m air temperatures and can also be assessed using remote sensing techniques. Remote sensing is especially valuable over the Greenland Ice Sheet, where few ground-based air temperature measurements exist. Because of the presence of surface-based temperature inversions in ice-covered areas, differences between 2 m air temperature and the temperature of the actual snow surface (referred to as "skin" temperature) can be significant and are particularly relevant when considering validation and application of remote sensing temperature data. We present results from a field campaign extending from 8 June to 18 July 2015, near Summit Station in Greenland, to study surface temperature using the following measurements: skin temperature measured by an infrared (IR) sensor, 2 m air temperature measured by a National Oceanic and Atmospheric Administration (NOAA) meteorological station, and a Moderate Resolution Imaging Spectroradiometer (MODIS) surface temperature product. Our data indicate that 2 m air temperature is often significantly higher than snow skin temperature measured in situ, and this finding may account for apparent biases in previous studies of MODIS products that used 2 m air temperature for validation. This inversion is present during our study period when incoming solar radiation and wind speed are both low. As compared to our in situ IR skin temperature measurements, after additional cloud masking, the MOD/MYD11 Collection 6 surface temperature standard product has an RMSE of 1.0 °C and a mean bias of -0.4 °C, spanning a range of temperatures from -35 to -5 °C (RMSE Combining double low line 1.6 °C and mean bias Combining double low line -0.7 °C prior to cloud masking). For our study area and time series, MODIS surface temperature products agree with skin surface temperatures better than previous studies indicated, especially at temperatures below -20 °C, where other studies found a significant cold bias. We show that the apparent cold bias present in other comparisons of 2 m air temperature and MODIS surface temperature may be a result of the near-surface temperature inversion. Further investigation of how in situ IR skin temperatures compare to MODIS surface temperature at lower temperatures (below -35 °C) is warranted to determine whether a cold bias exists for those temperatures. © Author(s) 2018.
学科领域	air temperature; climate change; climate effect; ground-based measurement; MODIS; NOAA satellite; solar radiation; summer; surface temperature; temperature inversion; Arctic; Greenland; Greenland Ice Sheet; Summit
语种	英语
scopus关键词	air temperature; climate change; climate effect; ground-based measurement; MODIS; NOAA satellite; solar radiation; summer; surface temperature; temperature inversion; Arctic; Greenland; Greenland Ice Sheet; Summit
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119200
作者单位	Thayer School of Engineering, Dartmouth College, Hanover, NH, United States; Department of Physics, St. Olaf College, Northfield, MN, United States; Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States; Cryospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States
推荐引用方式 GB/T 7714	Adolph A.C.,Albert M.R.,Hall D.K.. Near-surface temperature inversion during summer at Summit, Greenland, and its relation to MODIS-derived surface temperatures[J],2018,12(3).
APA	Adolph A.C.,Albert M.R.,&Hall D.K..(2018).Near-surface temperature inversion during summer at Summit, Greenland, and its relation to MODIS-derived surface temperatures.Cryosphere,12(3).
MLA	Adolph A.C.,et al."Near-surface temperature inversion during summer at Summit, Greenland, and its relation to MODIS-derived surface temperatures".Cryosphere 12.3(2018).