Preprints
https://doi.org/10.5194/amt-2022-204
https://doi.org/10.5194/amt-2022-204
 
20 Jul 2022
20 Jul 2022
Status: this preprint is currently under review for the journal AMT.

Assessing the consistency of satellite derived upper tropospheric humidity measurements

Lei Shi1, Carl J. Schreck III2, Viju O. John3, Eui-Seok Chung4, Theresa Lang5,6, Stefan A. Buehler5, and Brian J. Soden7 Lei Shi et al.
  • 1NOAA NESDIS National Centers for Environmental Information (NCEI), Asheville, NC, USA
  • 2Cooperative Institute for Satellite Earth System Studies (CISESS), North Carolina State University, Asheville, NC, USA
  • 3EUMETSAT and Met Office Hadley Centre, Exeter, UK
  • 4Korea Polar Research Institute, Incheon, South Korea
  • 5Meteorological Institute, Universität Hamburg, Germany
  • 6International Max Planck Research School on Earth System Modelling, Max Planck Institute for Meteorology, Hamburg, Germany
  • 7Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, USA

Abstract. Four upper tropospheric humidity (UTH) datasets derived from satellite sounders are evaluated to assess their consistency as part of the activities for the Global Energy and Water Exchanges (GEWEX) water vapor assessment project. The datasets include UTH computed from brightness temperature measurements of the 183.31 ± 1 GHz channel of the Special Sensor Microwave – Humidity (SSM/T-2), Advanced Microwave Sounding Unit-B (AMSU-B), and Microwave Humidity Sounder (MHS), and from channel 12 of the High-Resolution Infrared Radiation Sounder (HIRS). The four datasets are consistent in the interannual temporal and spatial variability of the tropics. Large positive anomalies peaked over the central equatorial Pacific region during El Niño events in the same phase with the increase of sea surface temperature. Conversely, large negative anomalies were obtained during El Niño events when the tropical domain average is taken. The weakened ascending branch of the Pacific Walker circulation in the western Pacific and the enhanced descending branches of the local Hadley circulation along the Pacific subtropics largely contributed to widespread drying areas and thus negative anomalies in the upper troposphere during El Niño events as shown in all four datasets. Due to differences in retrieval definitions, calibration methods, and sensor limitations, there are differences in spatial anomalies and temporal change rates, where more significant anomaly values are usually found in the microwave UTH data.

Lei Shi et al.

Status: open (until 14 Sep 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2022-204', Richard Allan, 09 Aug 2022 reply

Lei Shi et al.

Lei Shi et al.

Viewed

Total article views: 144 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
122 20 2 144 1 1
  • HTML: 122
  • PDF: 20
  • XML: 2
  • Total: 144
  • BibTeX: 1
  • EndNote: 1
Views and downloads (calculated since 20 Jul 2022)
Cumulative views and downloads (calculated since 20 Jul 2022)

Viewed (geographical distribution)

Total article views: 140 (including HTML, PDF, and XML) Thereof 140 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 09 Aug 2022
Download
Short summary
Four upper tropospheric humidity (UTH) datasets derived from satellite microwave and infrared sounders are evaluated to assess their consistency as part of the activities for the Global Energy and Water Exchanges (GEWEX) water vapor assessment project. The study shows that the four datasets are consistent in the interannual temporal and spatial variability of the tropics. However, differences are found in the strength of the anomalies and changing rates in the common period.