Details:

Journal Title:
Journal of Geophysical Research: Atmospheres
Personal Author:
Meng, D. ; Chen, Y. ; Li, J. ; Tan, Z.-M. ; Wang, P. ; ... More +
Meng, D. ; Chen, Y. ; Li, J. ; Tan, Z.-M. ; Wang, P. ; Lee, J.-R. ; Li, J. ; Li, Z. Less -
NOAA Program & Office:
CIMSS (Cooperative Institute for Meteorological Satellite Studies)
Description:
All-sky assimilation of infrared (IR), near-IR, and visible band measurements are beneficial for forecasting cloud-covered tropical cyclones, but numerous challenges remain. This study uses the combined assimilation of clear-sky water vapor radiances and the cloud liquid/ice water path (CWP) retrieved from the Advanced Baseline Imager on the new generation geostationary environmental satellites. The two measurements are spatial complementary to one another. Microphysics schemes, cumulus parameterizations, and dynamic CWP observation errors are optimized using sensitivity tests. The cycling assimilations and subsequent forecasts of Hurricane Irma (2017) are investigated to assess the added value of the combined assimilation and its impacts on hurricane forecasts. Comparisons with ERA5 and dropsonde observations from the National Hurricane Operations Plan show that the combined assimilation can improve the prognostic variables of Hurricane Irma (2017) for both the large-scale circumstances and the inner-core area, resulting in a clear improvement in hurricane track and intensity predictions. The detailed diagnostics show that the improved track predictions can be attributed to the more precise steering flow produced by the combined assimilation. Moreover, the additional CWP assimilation allows for a more accurate initialization of water vapor in the hurricane's inner-core area when the model produces dry simulated water vapor bias. Then the subsequent phase changes of water vapor improve the hurricane intensity forecasting by enhancing the feedback between heating and vortex circulation. The combined assimilation shows the potential value of better utilization of all-sky satellite measurements to improve hurricane initialization and forecast.
Keywords:
[+]
Clouds Geostationary Satellites Hurricanes All-sky Assimilation Cloud Observations Hydrometeor Observation Operator
Source:
Journal of Geophysical Research: Atmospheres, 127, e2022JD036910
DOI:
https://doi.org/10.1029/2022JD036910
Format:
PDF
Document Type:
Journal Article
License:
https://creativecommons.org/licenses/by/4.0/
Rights Information:
Other
Compliance:
Submitted
Main Document Checksum:
[+]
urn:sha256:1c5e26a9631ae579b0dd4cb4dd334a339136b0b9c32373a8eea98e0848f44aa6
Download URL:
https://repository.library.noaa.gov/view/noaa/50412/noaa_50412_DS1.pdf
File Type:

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