DOI: 10.1002/2017JC013324
Scopus记录号: 2-s2.0-85041059508
论文题名: Spatial and Temporal Patterns of Chlorophyll Concentration in the Southern California Bight
作者: Nezlin N.P. ; McLaughlin K. ; Booth J.A.T. ; Cash C.L. ; Diehl D.W. ; Davis K.A. ; Feit A. ; Goericke R. ; Gully J.R. ; Howard M.D.A. ; Johnson S. ; Latker A. ; Mengel M.J. ; Robertson G.L. ; Steele A. ; Terriquez L. ; Washburn L. ; Weisberg S.B.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 1 起始页码: 231
结束页码: 245
语种: 英语
英文关键词: chlorophyll
; interannual variations
; Southern California Bight
Scopus关键词: annual variation
; anthropogenic source
; chlorophyll a
; coastal zone
; concentration (composition)
; continental shelf
; gyre
; mixed layer
; nitrate
; nutrient enrichment
; Pacific Decadal Oscillation
; phytoplankton
; spatiotemporal analysis
; water column
; Pacific Ocean
; Southern California Bight
英文摘要: Distinguishing between local, anthropogenic nutrient inputs and large-scale climatic forcing as drivers of coastal phytoplankton biomass is critical to developing effective nutrient management strategies. Here we assess the relative importance of these two drivers by comparing trends in chlorophyll-a between shallow coastal (0.1–16.5 km) and deep offshore (17–700 km) areas, hypothesizing that coastal regions influenced by anthropogenic nutrient inputs may have different spatial and temporal patterns in chlorophyll-a concentration from offshore regions where coastal inputs are less influential. Quarterly conductivity-temperature-depth (CTD) fluorescence measurements collected from three southern California continental shelf regions since 1998 were compared to chlorophyll-a data from the more offshore California Cooperative Fisheries Investigations (CalCOFI) program. The trends in the coastal zone were similar to those offshore, with a gradual increase of chlorophyll-a biomass and shallowing of its maximum layer since the beginning of observations, followed by chlorophyll-a declining and deepening from 2010 to present. An exception was the northern coastal part of SCB, where chlorophyll-a continued increasing after 2010. The long-term increase in chlorophyll-a prior to 2010 was correlated with increased nitrate concentrations in deep waters, while the recent decline was associated with deepening of the upper mixed layer, both linked to the low-frequency climatic cycles of the Pacific Decadal Oscillation and North Pacific Gyre Oscillation. These large-scale factors affecting the physical structure of the water column may also influence the delivery of nutrients from deep ocean outfalls to the euphotic zone, making it difficult to distinguish the effects of anthropogenic inputs on chlorophyll along the coast. © 2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114860
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Southern California Coastal Water Research Project Authority, Costa Mesa, CA, United States; City of Los Angeles, Bureau of Sanitation, Playa del Rey, CA, United States; Henry Samueli School of Engineering, University of California, Irvine, Irvine, CA, United States; Public Utilities Department, City of San Diego, San Diego, CA, United States; Scripps Institution of Oceanography, La Jolla, CA, United States; Sanitation Districts of Los Angeles County (LACSD), Whittier, CA, United States; Aquatic Bioassay Consulting Laboratories, Ventura, CA, United States; Orange County Sanitation District (OCSD), Fountain Valley, CA, United States; Marine Science Institute, University of California, Santa Barbara, Santa Barbara, CA, United States
Recommended Citation:
Nezlin N.P.,McLaughlin K.,Booth J.A.T.,et al. Spatial and Temporal Patterns of Chlorophyll Concentration in the Southern California Bight[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(1)