Measuring and Modeling Oceanic Air-Sea Fluxes
There have been numerous studies evaluating model representation of the latent heat flux (LHF) over terrestrial surfaces due to LHF’s role in weather prediction, heat balance, and the hydrological cycle. However, LHF model representation over the ocean, where 86% of global evaporation occurs, has be...
Main Author: | |
---|---|
Format: | Text |
Language: | unknown |
Published: |
OpenCommons@UConn
2016
|
Subjects: | |
Online Access: | https://opencommons.uconn.edu/gs_theses/925 https://opencommons.uconn.edu/cgi/viewcontent.cgi?article=2007&context=gs_theses |
id |
ftunivconn:oai:opencommons.uconn.edu:gs_theses-2007 |
---|---|
record_format |
openpolar |
spelling |
ftunivconn:oai:opencommons.uconn.edu:gs_theses-2007 2023-05-15T17:36:12+02:00 Measuring and Modeling Oceanic Air-Sea Fluxes Rosenberg, Aaron M 2016-05-05T07:00:00Z application/pdf https://opencommons.uconn.edu/gs_theses/925 https://opencommons.uconn.edu/cgi/viewcontent.cgi?article=2007&context=gs_theses unknown OpenCommons@UConn https://opencommons.uconn.edu/gs_theses/925 https://opencommons.uconn.edu/cgi/viewcontent.cgi?article=2007&context=gs_theses Master's Theses Oceanography Meteorology Latent Heat Flux Air-Sea Interactions text 2016 ftunivconn 2022-07-11T18:37:03Z There have been numerous studies evaluating model representation of the latent heat flux (LHF) over terrestrial surfaces due to LHF’s role in weather prediction, heat balance, and the hydrological cycle. However, LHF model representation over the ocean, where 86% of global evaporation occurs, has been largely untested due to the scarcity of in-situ measurements and difficulties associated with open ocean observations. This study evaluates the Weather Research and Forecasting Model (WRF) latent heat, sensible heat and momentum surface fluxes over the Sub-tropical North Atlantic Ocean from September 16 to October 30, 2012 under various surface layer and planetary boundary layer (PBL) parameterization schemes. WRF output is validated against bulk and direct covariance flux observations collected during the NASA Salinity Processes in the Upper-Ocean Regional Study (SPURS) from a highly instrumented surface mooring and surveying research vessel. WRF is also compared to the OAFlux hindcast product at an interpolated 1-day, 1-degree resolution. WRF produced a persistent positive bias in LHF when evaluated against buoy and ship measurements at respective locations in all native parameterization schemes. Modifications to surface layer schemes were employed to mimic the functionality of the COARE3.5 bulk flux algorithm. These modifications reduced root mean square error (RMSE) and model bias in LHF for the default surface layer scheme known as MM5. The inclusion of COARE3.5 functionality had a slightly negative impact on a preferred surface physics scheme known as MYNN, which had already been modified to use the COARE3.0 algorithm. The MYNN scheme with COARE3.0 provided the minimum RMSE between model and observations. Results for momentum flux agreed with these findings. OAFlux closely agreed with SPURS validation data and produced lower surface LHF than WRF across the domain throughout the test case. This study has found that the WRF overestimation of surface fluxes is the result of inaccurate model physics; e.g., ... Text North Atlantic University of Connecticut (UConn): DigitalCommons@UConn |
institution |
Open Polar |
collection |
University of Connecticut (UConn): DigitalCommons@UConn |
op_collection_id |
ftunivconn |
language |
unknown |
topic |
Oceanography Meteorology Latent Heat Flux Air-Sea Interactions |
spellingShingle |
Oceanography Meteorology Latent Heat Flux Air-Sea Interactions Rosenberg, Aaron M Measuring and Modeling Oceanic Air-Sea Fluxes |
topic_facet |
Oceanography Meteorology Latent Heat Flux Air-Sea Interactions |
description |
There have been numerous studies evaluating model representation of the latent heat flux (LHF) over terrestrial surfaces due to LHF’s role in weather prediction, heat balance, and the hydrological cycle. However, LHF model representation over the ocean, where 86% of global evaporation occurs, has been largely untested due to the scarcity of in-situ measurements and difficulties associated with open ocean observations. This study evaluates the Weather Research and Forecasting Model (WRF) latent heat, sensible heat and momentum surface fluxes over the Sub-tropical North Atlantic Ocean from September 16 to October 30, 2012 under various surface layer and planetary boundary layer (PBL) parameterization schemes. WRF output is validated against bulk and direct covariance flux observations collected during the NASA Salinity Processes in the Upper-Ocean Regional Study (SPURS) from a highly instrumented surface mooring and surveying research vessel. WRF is also compared to the OAFlux hindcast product at an interpolated 1-day, 1-degree resolution. WRF produced a persistent positive bias in LHF when evaluated against buoy and ship measurements at respective locations in all native parameterization schemes. Modifications to surface layer schemes were employed to mimic the functionality of the COARE3.5 bulk flux algorithm. These modifications reduced root mean square error (RMSE) and model bias in LHF for the default surface layer scheme known as MM5. The inclusion of COARE3.5 functionality had a slightly negative impact on a preferred surface physics scheme known as MYNN, which had already been modified to use the COARE3.0 algorithm. The MYNN scheme with COARE3.0 provided the minimum RMSE between model and observations. Results for momentum flux agreed with these findings. OAFlux closely agreed with SPURS validation data and produced lower surface LHF than WRF across the domain throughout the test case. This study has found that the WRF overestimation of surface fluxes is the result of inaccurate model physics; e.g., ... |
format |
Text |
author |
Rosenberg, Aaron M |
author_facet |
Rosenberg, Aaron M |
author_sort |
Rosenberg, Aaron M |
title |
Measuring and Modeling Oceanic Air-Sea Fluxes |
title_short |
Measuring and Modeling Oceanic Air-Sea Fluxes |
title_full |
Measuring and Modeling Oceanic Air-Sea Fluxes |
title_fullStr |
Measuring and Modeling Oceanic Air-Sea Fluxes |
title_full_unstemmed |
Measuring and Modeling Oceanic Air-Sea Fluxes |
title_sort |
measuring and modeling oceanic air-sea fluxes |
publisher |
OpenCommons@UConn |
publishDate |
2016 |
url |
https://opencommons.uconn.edu/gs_theses/925 https://opencommons.uconn.edu/cgi/viewcontent.cgi?article=2007&context=gs_theses |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Master's Theses |
op_relation |
https://opencommons.uconn.edu/gs_theses/925 https://opencommons.uconn.edu/cgi/viewcontent.cgi?article=2007&context=gs_theses |
_version_ |
1766135604530118656 |