Boreal summer intraseasonal oscillation in a  superparameterized general circulation model:  effects of air–sea coupling and ocean mean state

Gao, Yingxia; Klingaman, Nicholas P.; DeMott, Charlotte A.; Hsu, Pang-Chi

doi:https://doi.org/10.5194/gmd-13-5191-2020

Articles | Volume 13, issue 11

https://doi.org/10.5194/gmd-13-5191-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/gmd-13-5191-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 13, issue 11

Model experiment description paper

|

02 Nov 2020

Model experiment description paper |

| 02 Nov 2020

Boreal summer intraseasonal oscillation in a superparameterized general circulation model: effects of air–sea coupling and ocean mean state

Yingxia Gao, Nicholas P. Klingaman, Charlotte A. DeMott, and Pang-Chi Hsu

Data sets

BSISO in SP GCMs: effects of air–sea coupling and mean-state biases Y. Gao https://doi.org/10.6084/m9.figshare.c.4874406.v3

NOAA Interpolated Outgoing Longwave Radiation (OLR) Physical Sciences Laboratory https://psl.noaa.gov/data/gridded/data.interp_OLR.html

Index of /data/global-precipitation-climatology-project-gpcp-daily/access NOAA https://www.ncei.noaa.gov/data/global-precipitation-climatology-project-gpcp-daily/access/

Model code and software

spcam3-kpp: SPCAM3-KPP release 1.0 N. P. Klingaman https://doi.org/10.5281/zenodo.4021071

Short summary

Both the air–sea coupling and ocean mean state affect the fidelity of simulated boreal summer intraseasonal oscillation (BSISO). To elucidate their relative effects on the simulated BSISO, a set of experiments was conducted using a superparameterized AGCM and its coupled version. Both air–sea coupling and cold ocean mean state improve the BSISO amplitude due to the suppression of the overestimated variance, while the former (latter) could further upgrade (degrade) the BSISO propagation.