The Equatorial Undercurrent and TAO sampling bias from a decade at SEA
MetadataShow full item record
The NOAA Tropical Atmosphere Ocean (TAO) moored array has, for three decades, been a valuable resource for monitoring and forecasting El Niño–Southern Oscillation and understanding physical oceanographic as well as coupled processes in the tropical Pacific influencing global climate. Acoustic Doppler current profiler (ADCP) measurements by TAO moorings provide benchmarks for evaluating numerical simulations of subsurface circulation including the Equatorial Undercurrent (EUC). Meanwhile, the Sea Education Association (SEA) has been collecting data during repeat cruises to the central equatorial Pacific Ocean (160°–126°W) throughout the past decade that provide useful cross validation and quantitative insight into the potential for stationary observing platforms such as TAO to incur sampling biases related to the strength of the EUC. This paper describes some essential sampling characteristics of the SEA dataset, compares SEA and TAO velocity measurements in the vicinity of the EUC, shares new insight into EUC characteristics and behavior only observable in repeat cross-equatorial sections, and estimates the sampling bias incurred by equatorial TAO moorings in their estimates of the velocity and transport of the EUC. The SEA high-resolution ADCP dataset compares well with concurrent TAO measurements (RMSE = 0.05 m s−1; R2 = 0.98), suggests that the EUC core meanders sinusoidally about the equator between ±0.4° latitude, and reveals a mean sampling bias of equatorial measurements (e.g., TAO) of the EUC’s zonal velocity of −0.14 ± 0.03 m s−1 as well as a ~10% underestimation of EUC volume transport. A bias-corrected monthly record and climatology of EUC strength at 140°W for 1990–2010 is presented.
Author Posting. © American Meteorological Society, 2014. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Atmospheric and Oceanic Technology 21 (2014): 2015–2025, doi:10.1175/JTECH-D-13-00262.1.
Suggested CitationArticle: Leslie, William R., Karnauskas, Kristopher B., "The Equatorial Undercurrent and TAO sampling bias from a decade at SEA", Journal of Atmospheric and Oceanic Technology 21 (2014): 2015–2025, DOI:10.1175/JTECH-D-13-00262.1, https://hdl.handle.net/1912/6835
Showing items related by title, author, creator and subject.
Scientific sampling event log from ARSV Laurence M. Gould LMG1110 in the Southern Ocean from Nov. 2011 (Salp_Antarctic project) Bucklin, AnnThe event log to record all instrument deployments during the cruise. For a complete list of measurements, refer to the supplemental document 'Field_names.pdf', and a full dataset description is included in the supplemental ...
Nitrogen fixation rates from samples collected in the Chukchi Sea, Arctic Ocean near Barrow, Alaska in August of 2011 (ArcticNITRO project) Sipler, Rachel E.; Bronk, Deborah; Yager, Patricia L. (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: email@example.com, 2017-06-08)This dataset provides rates of nitrogen fixation for the coastal Chukchi Sea near Barrow, Alaska. Nitrogen fixation supplies ‘new’ nitrogen to the global ocean and supports primary production and impacts global biogeochemical ...
Chen, Sue; Cummings, James A.; Schmidt, Jerome M.; Sanabia, Elizabeth; Jayne, Steven R. (John Wiley & Sons, 2017-05-13)A 3-D variational ocean data assimilation adjoint approach is used to examine the impact of ocean observations on coupled tropical cyclone (TC) model forecast error for three recent hurricanes: Isaac (2012), Hilda (2015), ...