Details:

Journal Title:
Remote Sensing of Environment
Personal Author:
Yu, Lisan ; Jin, Xiangze
Yu, Lisan ; Jin, Xiangze Less -
NOAA Program & Office:
CINAR (Cooperative Institute for the North Atlantic Region) ; OAR (Oceanic and Atmospheric Research)
CINAR (Cooperative Institute for the North Atlantic Region) ; OAR (Oceanic and Atmospheric Research) Less -
Description:
Near-surface specific humidity (qa) and air temperature (Ta) over the global ocean are important meteorological variables, but they cannot be retrieved directly from remote sensing. Many efforts have been made to develop algorithms that derive qa and Ta from multisensor microwave and/or infrared observations using in situ measurements as training datasets. However, uncertainty remains large in the resultant qa and Ta retrievals. In this study, 147 moored surface buoys are used to examine how buoy measured qa and Ta are related to satellite microwave brightness temperature (Tb) on the spatial scale from the warm/humid tropics to the cold/dry high latitudes. It is found that the Tb – qa and Tb – Ta relations are structured along two distinct, near-linear bands, with the primary band in the warm/humid regime and a secondary (weaker) band in the cold/dry regime. The step-like transition (or separation) between the two regimes occurs at 8–10 g kg−1 for qa and 14–17 °C for Ta. The evidence suggests that one algorithm may not be sufficient to extract qa and Ta from Tb in all regimes. Therefore, a high-latitude enhancement is added to the global algorithm so that the qa and Ta retrievals in the dry/cold regime can be specifically addressed. The new algorithms are applied to 11 microwave sensors, including SSM/I, SSMIS, and AMSU-A, from 1988 to 2016. Based on the 475,717 buoy collocations during the 29-year period, the retrieved qa and Ta have root-mean-square differences of 0.82 g kg−1 and 0.51 °C, respectively.
Keywords:
[+]
Humidity Microwave Remote Sensing Temperature
Source:
Remote Sensing of Environment, 215, 199-216
DOI:
https://doi.org/10.1016/j.rse.2018.06.001
Document Type:
Journal Article
Funding:
Grant no. NA14OAR4320158
Rights Information:
Accepted Manuscript
Compliance:
Submitted
Main Document Checksum:
[+]
urn:sha256:8182cc3fa282d12f2d2600113c42107cbab7d42add06e0722f7ba0816ee26005
Download URL:
https://repository.library.noaa.gov/view/noaa/27151/noaa_27151_DS1.pdf
File Type:

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