Program and Agenda

Abstract

QUANTIFYING THE SURFACE FRESHWATER FLUX AT STATION ALOHA

Quantifying freshwater flux at the sea surface is a first-order challenge that needs to be addressed to understand the role of the ocean in the hydrological cycle and to interpret upper ocean salinity variations, and to understand their impacts on ocean dynamics and ecosystems. Here we use multiple data sources from Station ALOHA to investigate the freshwater flux. Surface flux measurements from the WHOI-Hawaii Ocean Time-series Site (WHOTS) surface mooring span 2004-2013 and include rainfall measurements. Beginning in February 2007, the ALOHA Cabled Observatory (ACO) broadband hydrophone on the seafloor added an acoustic view of rainfall integrated over an estimated ~300 km2. Towards calibrating the acoustic signatures, we follow Nystuen and Ma (2005) and compare measurements from WHOTS and ACO during strong rainfall events, especially the December 4, 2012 event which occurred during a HOT cruise with a number of additional rainfall measurements. We also use estimates from the NOAA NEXRAD weather radar on Molokai, which have a footprint comparable to the ACO hydrophone. We compare the results with atmospheric NWP reanalysis products.

http://uop.whoi.edu/projects/WHOTS/whots.html

Authors

Lukas, R., University of Hawaii, USA, rlukas@hawaii.edu

Santiago-Mandujano, F. E., University of Hawaii, USA, mandujan@soest.hawaii.edu

Plueddemann, A. J., Woods Hole Oceanographic Institution, USA, aplueddemann@whoi.edu

Weller, R. A., Woods Hole Oceanographic Institution, USA, rweller@whoi.edu

Duennebier, F. K., University of Hawaii, USA, fred@soest.hawaii.edu

Details

Oral presentation

Session #:049
Date: 2/27/2014
Time: 14:15
Location: 313 B

Presentation is given by student: No