Introduction of J-OFURO version 2 surface heat flux data set and its analysis over the North Pacific
Abstract
Japanese Ocean Flux Data Sets with Use of Remote Sensing Observations (J-OFURO) includes global ocean surface heat flux data derived from satellite data and are used in many studies related to air-sea interaction. Recently new surface heat flux data was constructed in J-OFURO as the version 2. In the version 2 many points are improved compared with the version 1. Since we used wind speed and specific humidity data derived from one DMSP/SSMI sensor in the version 1, we obtained two data at most one day. Therefore, there may be large sampling errors for the daily-mean value. In order to escape this problem, multi-satellite data (DMSP/SSMI F08- 15, Aqua/AMSR-E, TRMM/TMI, ERS/AMI and QuikScat/SeaWinds) are used in the version 2. As a result we could improve accuracy and temporal resolution from 3-days mean value in version 1 to daily-mean value in version 2. Also we used an Optimum Interpolation method to estimate specific humidity data instead of a simple mean method. We basically need sea surface temperature (SST), specific humidity and wind speed data for estimation of latent heat flux. In version 1 we used NCEP data (Reynolds and Smith, 1994) as SST data. However, the temporal resolution of the data is based on weekly and considerably low. Recently there are many kinds of global SST data because we can obtain SST data using a microwave radiometer sensor such as TRMM/MI and Aqua/AMSR-E. Therefore, we compared many SST products and determined to use Merged satellite and in situ data Global Daily (MGD) SST provided by Japan Meteorological Agency. A bulk algorithm used for estimation of turbulent heat flux is changed from Kondo (1975) to COASRE 3.0(Fairall et al., 2003). Shortwave and longwave radiation data are based on the ISCCP product and some modifications are carried out for longwave radiation. Finally surface latent and sensible flux data and shortwave and longwave radiation data are extended to1989- 2004. In this presentation we will introduce surface heat flux data in J-OFURO version 2 and comparison and validation results of latent heat flux with data such as GSSTF2, HOAPS and OAFlux etc. Moreover, we analyze variability of surface heat flux over the North Pacific.
- Publication:
-
AGU Spring Meeting Abstracts
- Pub Date:
- May 2007
- Bibcode:
- 2007AGUSM.A23E..08T
- Keywords:
-
- 3305 Climate change and variability (1616;
- 1635;
- 3309;
- 4215;
- 4513);
- 3349 Polar meteorology;
- 3360 Remote sensing;
- 4215 Climate and interannual variability (1616;
- 1635;
- 3305;
- 3309;
- 4513);
- 4247 Marine meteorology