Intercalibration and Validation of Observations From ATMS and SAPHIR Microwave Sounders
Artikel i vetenskaplig tidskrift, 2015

This paper evaluates the radiometric accuracy of observations from the Advanced Technology Microwave Sounder (ATMS) onboard Suomi National Polar-orbiting Partnership and Sondeur Atmospherique du Profil d' Humidite Intropicale par Radiometrie (SAPHIR) onboard Megha-Tropiques through intercalibration and validation versus in situ radiosonde and Global Positioning System Radio Occultation (GPS-RO) observations. SAPHIR and ATMS water vapor channels operate at slightly different frequencies. We calculated the bias due to radiometric errors as the difference between the observed and simulated differences between the two instruments. This difference, which is often referred to as double difference, ranges between 0.3 and 0.7 K, which shows good consistency between the instruments. We used a radiative transfer model to simulate the satellite brightness temperatures (Tbs) using radiosonde and GPS-RO profiles and then compared simulated and observed Tbs. The difference between radiosonde and ATMS Tbs for the middle and upper tropospheric temperature sounding channels was less than 0.5 K at most stations, but the difference between radiosonde and ATMS/SAPHIR Tbs for water vapor channels was between 0.5 and 2.0 K. The larger bias for the water vapor channels is mainly due to several errors in radiosonde humidity observations. The mean differences between the ATMS observations and the Tbs simulated using GPS-RO profiles were 0.2, 0.3, 0.4, 0.2, and -0.2 K for channels 10-14, respectively; and the uncertainty increases from 0.02 K for channel 10 to 0.07 K for channel 14.

sensor

1991

p1201

satellite

temperature

remote sensing

bulletin of the american meteorological society

surveys in geophysics

retrievals

hydrology

lower troposphere

okes gm

& Photographic Technology

v12

Climate change

cloud ice

Imaging Science

Geochemistry & Geophysics

p63

data record

radiosonde

Joint Polar Satellite System (JPSS)

water vapor

v75

calibration

oudhury bj

Engineering

microwave

1994

Remote Sensing

prelaunch

Författare

I. Moradi

University of Maryland

National Oceanic and Atmospheric Administration

R. R. Ferraro

National Oceanic and Atmospheric Administration

Patrick Eriksson

Chalmers, Rymd- och geovetenskap, Global miljömätteknik och modellering

F. Z. Weng

National Oceanic and Atmospheric Administration

IEEE Transactions on Geoscience and Remote Sensing

0196-2892 (ISSN)

Vol. 53 5915-5925 7122324

Ämneskategorier

Klimatforskning

DOI

10.1109/tgrs.2015.2427165