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Preprints
https://doi.org/10.5194/acp-2020-18
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-18
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  27 Mar 2020

27 Mar 2020

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A revised version of this preprint is currently under review for the journal ACP.

Assessment of vertical air motion among reanalyses and qualitative comparison with direct VHF radar measurements over the two tropical stations

Kizhathur Narasimhan Uma1, Siddarth Shankar Das1, Madineni Venkat Ratnam2, and Kuniyil Viswanathan Suneeth1 Kizhathur Narasimhan Uma et al.
  • 1Space Physics Laboratory, Vikram Sarabhai Space Centre, ISRO, Trivandrum – 695022, India
  • 2National Atmospheric Research Laboratory, Dept. of Space, Gadanki – 517112, India

Abstract. Vertical wind (w) is one of the most important meteorological parameters for understanding different atmospheric phenomena. Only very few direct measurements of w are available and most of the time one must depend on reanalysis products. In the present study, assessment of w among selected reanalyses, (ERA-Interim, ERA-5, MERRA-2, NCEP-2 and JRA-55) and qualitative comparison of those datasets with direct VHF radar measurements over the convectively active regions Gadanki (13.5° N and 79.2° E) and Kototabang (0° S and 100.2° E) are presented for the first time. The magnitude of w derived from reanalyses is 10–50 % less than that from the direct radar observations. Radar measurements of w show downdrafts below 8 to 10 km and updrafts above 8–10 km over both locations. Inter-comparison between the reanalyses shows that ERAi is overestimating NCEP-2 and underestimating all the reanalyses. Directional tendency shows that the percentage of updrafts captured is reasonably good, but downdrafts are not well captured by all reanalyses. Thus, caution is advised when using vertical velocities from reanalyses.

Kizhathur Narasimhan Uma et al.

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Kizhathur Narasimhan Uma et al.

Kizhathur Narasimhan Uma et al.

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Latest update: 21 Sep 2020
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Short summary
Reanalysis data of vertical wind (w) is widely used by the atmospheric community to determine various calculation of atmospheric circulations, diabatic heating, convection etc. There are no studies that assess the available reanalysis data with respect to the observations. The present study for the first time assess all the reanalysis w by comparing it with 20 years of radar data from Gadanki and Kototabang. It shows downdrafts and peak in the updrafts are not produced in the reanalyses.
Reanalysis data of vertical wind (w) is widely used by the atmospheric community to determine...
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