Salinity Rain Impact Model (Rim) Stratification Analysis Under Several Wind Speed Conditions

Keywords

Rain rate; Sea surface salinity; Stratification

Abstract

The Central Florida Remote Sensing Lab has developed a rain impact model (RIM) to estimate the changes in Aquarius sea surface salinity (SSS) due to the accumulation of precipitation prior to the satellite observation time. RIM uses HYCOM (Hybrid Coordinate Ocean Model) ocean surface salinities and the NOAA global rainfall product CMORPH, to model transient changes in the near-surface salinity profile. The original version of RIM, a 1D diffusion model, neglects the effects of wind and wave mixing. However, it was shown the mechanical mixing of the ocean caused by wind and waves rapidly reduces the salinity stratification caused by rain. Also, previous results using RIM, in the presence of moderate/high wind speeds, show that the model overestimates the rain effect on SSS. To address this issue, previous work (RIM-2) focused on the parameterization of the effects of wind on the vertical diffusivity (Kz). Preliminary results did not show great improvement, probably due to the fact that the mixing depth (d0) also varies with wind speed. Therefore, this paper will account for the wind speed effects on both Kz and d0 that result in a new version of the model, RIM-3. Results will be presented that compare RIM and RIM-3 at different depths for several parametrizations. Also, comparisons, between RIM-3 at depths of several meters with measurements from in-situ salinity instruments, will be presented.

Publication Date

10-31-2018

Publication Title

International Geoscience and Remote Sensing Symposium (IGARSS)

Volume

2018-July

Number of Pages

1523-1526

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1109/IGARSS.2018.8519358

Socpus ID

85064207362 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85064207362

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