Impacts of AMSU-A, MHS and IASI data assimilation on temperature and humidity forecasts with GSI–WRF over the western United States

Bao, Y.; Xu, J.; Powell Jr., A. M.; Shao, M.; Min, J.; Pan, Y.

doi:https://doi.org/10.5194/amt-8-4231-2015

Articles | Volume 8, issue 10

https://doi.org/10.5194/amt-8-4231-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/amt-8-4231-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 8, issue 10

Research article

|

14 Oct 2015

Research article |

| 14 Oct 2015

Impacts of AMSU-A, MHS and IASI data assimilation on temperature and humidity forecasts with GSI–WRF over the western United States

Y. Bao, J. Xu, A. M. Powell Jr., M. Shao, J. Min, and Y. Pan

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Final revised paper (published on 14 Oct 2015)
Preprint (discussion started on 25 Jun 2015)

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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- Supplement

RC C2011: 'Review', Anonymous Referee #1, 16 Jul 2015
- AC C2453: 'Impacts of AMSU-A/MHS and IASI Data Assimilation on Temperature and Humidity Forecasts with GSI/WRF over the Western United States', jianjun xu, 07 Aug 2015
  - AC C2463: 'Impacts of AMSU-A/MHS and IASI Data Assimilation on Temperature and Humidity Forecasts with GSI/WRF over the Western United States', jianjun xu, 07 Aug 2015
- AC C2518: 'Impacts of AMSU-A/MHS and IASI Data Assimilation on Temperature and Humidity Forecasts with GSI/WRF over the Western United States', jianjun xu, 10 Aug 2015
RC C2014: 'Referee#2 comments', Anonymous Referee #2, 16 Jul 2015
- AC C2456: 'Impacts of AMSU-A/MHS and IASI Data Assimilation on Temperature and Humidity Forecasts with GSI/WRF over the Western United States', jianjun xu, 07 Aug 2015
  - AC C2466: 'Impacts of AMSU-A/MHS and IASI Data Assimilation on Temperature and Humidity Forecasts with GSI/WRF over the Western United States', jianjun xu, 07 Aug 2015
    - AC C2517: 'Impacts of AMSU-A/MHS and IASI Data Assimilation on Temperature and Humidity Forecasts with GSI/WRF over the Western United States', jianjun xu, 10 Aug 2015
      - RC C2627: 'amtd-8-C2517-2015-supplement_referee#2_notes', Anonymous Referee #2, 18 Aug 2015

Short summary

The regional GSI-WRF system is underestimating the observed temperature in the LT and overestimating in the UT and LS. The microwave (MW) data assimilation (DA) reduced the forecast bias from the MT to the LS within 30-hour forecasts, and the conventional (CON) DA kept a smaller forecast bias in the LT for 2-day forecasts. The smallest bias in the humidity forecast occurred at the surface and in the UT. The DA experiments apparently reduced the bias from the LT to UT, especially for the IR DA.