implementation of new orographic drag parameterization scheme to alleviate wind bias in E3SM #6665
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Updated with oro drag schemes and new topography input. *********1*********2*********3*********4*********5*********6*********7** Longer commit message body describing the commit. Can contain lists as follows: * Item 1 * Item 2 * Item 3 A good commit message should be written like an email, a subject followed by a blank line, followed by a more descriptive body. Can also contain a tag at the bottom describing what type of commit this is. [BFB] - Bit-For-Bit [FCC] - Flag Climate Changing [Non-BFB] - Non Bit-For-Bit [CC] - Climate Changing [NML] - Namelist Changing See confluence for a more detailed description about these tags.
Added orographic drag toolkit for topo generation. *********1*********2*********3*********4*********5*********6*********7** Longer commit message body describing the commit. Can contain lists as follows: * Item 1 * Item 2 * Item 3 A good commit message should be written like an email, a subject followed by a blank line, followed by a more descriptive body. Can also contain a tag at the bottom describing what type of commit this is. [BFB] - Bit-For-Bit [FCC] - Flag Climate Changing [Non-BFB] - Non Bit-For-Bit [CC] - Climate Changing [NML] - Namelist Changing See confluence for a more detailed description about these tags.
jinboxie
requested review from
mt5555,
tangq,
PeterCaldwell,
crterai and
golaz
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Is this PR BFB ? |
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Your 2 commits have no information in them. Please redo this. |
jinboxie
changed the title
Thank you Rob! The new PR is now here #6667. |
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The current pull request includes incorporation of a suite of new orographic drag parameterization schemes into E3SM. It includes 4 components all combined in one module (i.e. subroutine gwdo2d). The schemes include orographic gravity wave drag (oGWD), flow-blocking drag (FBD), small-scale GWD (sGWD), and turbulent-scale orographic form drag (TOFD).
The scheme are distributed by the interface named gwdo_gsd.
The oGWD, FBD, and sGWD are implemented in gw_drag.F90, while TOFD is implemented in clubb_intr.F90 to join the vertical diffusion process. Another change is in the startup_initialconds.F90/gw_drag.F90 where the new topographic parameters (OA, OC, OL) are input into the model
(formation of the topographic parameters are documented here).
The results tested in E3SMv2/v3 documented here. The overall 5-yr F2010 results between CTL run (default E3SMv3) and 3GWD-3FBD-sGWD-TOFD run (experimental run using new schemes) show that the new schemes help to alleviate the 10-m wind speed bias compared to ERA5 in E3SMv3.
Figure 1 5-yr F2010 simulation for E3SMv3 (0001-0005) vs ERA5 climatology (1979-2019) for 10-m wind speed (a-b) and 2-m temperature (c-d).