Hydrographic conditions near the coast of northwestern Baja California : 1997–2004
MetadataShow full item record
KeywordEl Nino phenomena; Coastal currents; Coastal upwelling; Hydrography; California Current System; Mexico; Northwestern Baja California; Geographic bounding coordinates: (33◦00’N, 117◦45’W) – (31◦40’N, 116◦30’W)
The effects of the 1997-98 and 2002-04 El Ni˜no on the upper waters in the con- tinental shelf and slope regions off northwestern Baja California are explored with data from eight cruises taken in late spring from 1998 to 2004 and the summers of 1997 and 1998. Geostrophic velocities were calculated referenced to a specific vol- ume anomaly surface separating the southward flowing California Current waters from the waters advected to the north by the California Undercurrent. The result- ing fields show equatorward flow near the surface except in the summer of 1997, when a poleward jet was found in the upper 40 dbars. This shallow jet advected anomalously warm and salty waters characteristic of the 1997-98 El Ni˜no, with its core found within 20-30 kms from the coast. By spring of 1998, the waters brought into the region by the jet had mixed across the pycnoline with the salty California Undercurrent waters below, resulting in high salinity levels on the density surfaces corresponding to the otherwise fresh California Current waters (25-26¾t). By con- trast, the 2002-04 El Ni˜no stands out for the very fresh and cold waters found on the same density surfaces in late spring of 2003 and 2004, marking a pronounced presence of subarctic waters. The fresh conditions found on the latter years repre- sent a nearshore expresion of the anomalous intrusion of subarctic waters observed 50-150 km from the coast of Southern California and Punta Eugenia, reported from July 2002 until April 2003. Our results suggest that the presence of this intrusion has continued to influence the region at least until May 2004.
Author Posting. © The Authors, 2006. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Continental Shelf Research 26 (2006): 885-901, doi:10.1016/j.csr.2006.01.017.
Suggested CitationPreprint: Perez-Brunius, Paula, Lopez, Manuel, Pineda, Jesus, "Hydrographic conditions near the coast of northwestern Baja California : 1997–2004", 2005-05-18, https://doi.org/10.1016/j.csr.2006.01.017, https://hdl.handle.net/1912/1122
Showing items related by title, author, creator and subject.
Limits of Nematoscelis megalops in the northwestern Atlantic in relation to Gulf Stream cold core rings. I, Horizontal and vertical distributions Wiebe, Peter H.; Boyd, Steven H. (Woods Hole Oceanographic Institution, 1979-01)The hydrographic limit of the distribution of Nematoscelis megalops in the Northwestern Atlantic Ocean is usually marked by the abrupt changes in water properties across the Gulf Stream. There are, however, isolated but ...
Limits of Nematoscelis megalops in the northwestern Atlantic in relation to Gulf Stream cold core rings. II, Physiological and biochemical effects of expatriation Boyd, Steven H.; Wiebe, Peter H.; Cox, James L. (Woods Hole Oceanographic Institution, 1979-01)Nematoscelis megalops, a cold water euphausiid commonly found in Northwestern Atlantic Slope Water, is frequently transported in the cores of Gulf Stream cyclonic rings into the Sargasso Sea. The inner core made of cold ...
Lankhorst, Matthias; Fratantoni, David M.; Ollitrault, Michel; Richardson, Philip L.; Send, Uwe; Zenk, Walter (2009-05-29)A comprehensive analysis of velocity data from subsurface floats in the northwestern tropical Atlantic at two depth layers is presented: one representing the Antarctic Intermediate Water (AAIW, pressure range 600–1050 ...