The Role of Convective Gustiness in Reducing Seasonal Precipitation Biases in the Tropical West Pacific

Harrop, Bryce E.; Ma, Po‐Lun; Rasch, Philip J.; Neale, Richard B.; Hannay, Cecile

doi:10.1002/2017ms001157

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The Role of Convective Gustiness in Reducing Seasonal Precipitation Biases in the Tropical West Pacific

2018
By Harrop, Bryce E. ; Ma, Po‐Lun ; Rasch, Philip J. ; ...
Source: Journal of Advances in Modeling Systems 10(4), 961-970, 2018

[PDF-1.33 MB]

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Journal Title:

Journal of Advances in Modeling Earth Systems
Personal Author:

Harrop, Bryce E. ; Ma, Po‐Lun ; Rasch, Philip J. ; Neale, Richard B. ; Hannay, Cecile

Harrop, Bryce E. ; Ma, Po‐Lun ; Rasch, Philip J. ; Neale, Richard B. ; Hannay, Cecile Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office)

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) Less -
Description:

Precipitation is an important climate quantity that is critically relevant to society. In spite of intense efforts, significant precipitation biases remain in most climate models. One pervasive and persistent bias found in many general circulation models occurs in the Tropical West Pacific where northern hemisphere summer-time precipitation is often underestimated compared to observations. Using the DOE-E3SM model, the inclusion of a missing process, convective gustiness, is shown to reduce those biases through a net increase in surface evaporation. Gustiness in surface wind fields is assumed to arise empirically in proportion to the intensity of convective precipitation. The increased evaporation can be treated as an increase in the moist static energy forcing into the atmosphere. A Normalized Gross Moist Stability (NGMS) framework (which characterizes the relationship between convective forcing and convective response) is used to explore the processes responsible for the precipitation bias, and the impact of the gustiness parameterization in reducing that bias. Because the NGMS of the Tropical West Pacific is less than unity in the E3SMv1 model, the increase in energy forcing amplifies the increase in precipitation to exceed that of the evaporative flux. Convective gustiness favors increased precipitation in regions where the resolved surface winds are weak and convection is present.
Keywords:

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Atmospheric Science Mathematical Models Rain And Rainfall
Source:

Journal of Advances in Modeling Systems 10(4), 961-970, 2018
DOI:

https://doi.org/10.1002/2017ms001157
Document Type:

Journal Article
Place as Subject:

Pacific Ocean
Rights Information:

CC BY-NC-ND
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PMC
Main Document Checksum:

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urn:sha256:abcee353e682c05908aa0a4d285cf2b13054524c9f9e2a65675a5812cf2ff00d
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https://repository.library.noaa.gov/view/noaa/25289/noaa_25289_DS1.pdf
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The Role of Convective Gustiness in Reducing Seasonal Precipitation Biases in the Tropical West Pacific

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