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  • 1
    Online Resource
    Online Resource
    On the correlation of seismic microtremors : CORRELATION OF SEISMIC MICROTREMORS
    American Geophysical Union (AGU) ; 2005
    In:  Journal of Geophysical Research: Solid Earth Vol. 110, No. B11 ( 2005-11)
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 110, No. B11 ( 2005-11)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2005JB003671
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2005
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  • 2
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    The cycling of sulfur in surface seawater of the northeast Pacific
    American Geophysical Union (AGU) ; 1994
    In:  Journal of Geophysical Research: Oceans Vol. 99, No. C4 ( 1994-04-15), p. 7835-7843
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 99, No. C4 ( 1994-04-15), p. 7835-7843
    Abstract: Oceanic dimethylsulfide (DMS) emissions to the atmosphere are potentially important to the Earth's radiative balance. Since these emissions are driven by the surface seawater concentration of DMS, it is important to understand the processes controlling the cycling of sulfur in surface seawater. During the third Pacific Sulfur/Stratus Investigation (PSI‐3, April 1991) we measured the major sulfur reservoirs (total organic sulfur, total low molecular weight organic sulfur, ester sulfate, protein sulfur, dimethylsulfoniopropionate (DMSP), DMS, dimethylsulfoxide) and quantified many of the processes that cycle sulfur through the upper water column (sulfate assimilation, DMSP consumption, DMS production and consumption, air‐sea exchange of DMS, loss of organic sulfur by particulate sinking). Under conditions of low plankton biomass ( 〈 0.4 μg/L chlorophyll a ) and high nutrient concentrations ( 〉 8 μM nitrate), 250 km off the Washington State coast, DMSP and DMS were 22% and 0.9%, respectively, of the total particulate organic sulfur pool. DMS production from the enzymatic cleavage of DMSP accounted for 29% of the total sulfate assimilation. However, only 0.3% of sulfate‐S assimilated was released to the atmosphere. From these data it is evident that air‐sea exchange is currently only a minor sink in the seawater sulfur cycle and thus there is the potential for much higher DMS emissions under different climatic conditions.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/93JC02782
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1994
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  • 3
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    Horizontal transport and the distribution of nutrients in the Coastal Transition Zone off northern California: Effects on primary production, phytoplankton biomass and species composition
    American Geophysical Union (AGU) ; 1991
    In:  Journal of Geophysical Research: Oceans Vol. 96, No. C8 ( 1991-08-15), p. 14833-14848
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 96, No. C8 ( 1991-08-15), p. 14833-14848
    Abstract: Conductivity‐temperature‐depth surveys during 1988 encountered strong baroclinic jets that were evident in acoustic Doppler current profiler and hydrographic data. During June and July 1988 a filament with high surface nitrate, high chlorophyll, abundant populations of neritic centric diatoms, and higher rates of primary production was evident perpendicular to the coast between Point Arena and Point Reyes. However, the high‐nutrient and phytoplankton regions were not in the baroclinic jets but were south and inshore of them. Surface water transported offshore by the strong baroclinic jets was found to have relatively low nutrient content, suggesting that the jets themselves do not carry significant levels of coastally upwelled, high‐nutrient water to the ocean interior. The low nutrient and salinity content of the jet suggests that the water originated several hundred kilometers upstream. Although the jets themselves do not appear to transport significant levels of nutrients directly from the coastal regime to the oceanic regime, dynamic processes associated with a meandering jet are likely responsible for high surface nutrients found several hundred kilometers offshore. Processes such as upwelling along the southern edge of the seaward jet result in significant enrichment of the coastal transition zone and in large blooms of neritic diatoms. During 1988 the high‐nutrient, high‐phytoplankton filament was present when the survey sequence began but then decayed after a month. The surface and subsurface nitrate fields were coherent with the dynamic topography field throughout the survey sequence; however, the surface and integrated chlorophyll fields were coherent only through the first two surveys. A decrease in phytoplankton biomass began during the third survey coincident with physical changes which occurred in that time frame: (1) an intensification of the undercurrent and (2) changes in the surface circulation from predominantly offshore to predominantly longshore. Understanding the processes responsible for the uncoupling between biology and physics is paramount for realistic biological models of this region.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/91JC01163
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1991
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  • 4
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    The structure of the transition zone between coastal waters and the open ocean off northern California, winter and spring 1987
    American Geophysical Union (AGU) ; 1991
    In:  Journal of Geophysical Research: Oceans Vol. 96, No. C8 ( 1991-08-15), p. 14707-14730
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 96, No. C8 ( 1991-08-15), p. 14707-14730
    Abstract: Physical and biological fields in the coastal transition zone off northern California were measured during February, March, May and June 1987 in an extended alongshore region between 60 km and 150 km offshore. The spring transition, as seen in coastal sea level and winds, occurred in mid‐March. Surface variability during the two spring cruises was stronger and of larger scale than that seen during the two winter cruises. An equatorward‐tending current, flowing along the boundary between low steric sea level inshore and high steric sea level offshore, dominated both the directly‐measured (acoustic Doppler current profiler) and geostrophic current fields during spring. Current jets of comparable strength directed both offshore and onshore were seen off Cape Mendocino and Point Arena; these evolved significantly in the 3 weeks between cruises. Inshore of the current, properties associated with upwelled water were found near the surface, including low temperature and high salinity, nutrients and chlorophyll; offshore of the current, waters were warmer, less saline, lower in nutrients and more oligotrophic. Geostrophic and directly measured volume transports in the current were about 2–3 Sv. Isopycnals inshore of the spring upwelling front were displaced vertically by O (40–80 m) from their depths during the winter survey; these displacements extended deep into the water column and were largely independent of depth between 100 and 400 m. Surface mixed layers tended to be deep in winter and shallower inshore of the upwelling front in spring. A connection between the equatorward‐tending frontal jet off northern California and the more well‐studied California Current further south is suggested by the similarity of their transports and of their dynamic height values.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/91JC01210
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1991
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  • 5
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    Important Contribution of Bacterial Carbon and Nitrogen to Sinking Particle Export
    American Geophysical Union (AGU) ; 2023
    In:  Geophysical Research Letters Vol. 50, No. 11 ( 2023-06-16)
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 50, No. 11 ( 2023-06-16)
    Abstract: We exploit d ‐amino acid biomarkers in multi‐year deep‐sea sediment trap time series to evaluate bacterial contribution to total export Bacterial detritus accounts for up to 19 ± 8% of sinking POC and up to 36 ± 14% of PN, making up a large unrecognized part of biological pump The relative contribution of bacterial detritus to sinking particles increases with decreased export production
    Type of Medium: Online Resource
    ISSN: 0094-8276 , 1944-8007
    URL: Article
    DOI: 10.1029/2022GL102485
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2023
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    detail.hit.zdb_id: 7403-2
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  • 6
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    Surface ocean-lower atmosphere interactions in the Northeast Pacific Ocean Gyre: Aerosols, iron, and the ecosystem response : AEROSOLS AND IRON IN THE NORTHEAST PACIFIC OCEAN
    American Geophysical Union (AGU) ; 2003
    In:  Global Biogeochemical Cycles Vol. 17, No. 2 ( 2003-06), p. n/a-n/a
    Details
    In: Global Biogeochemical Cycles, American Geophysical Union (AGU), Vol. 17, No. 2 ( 2003-06), p. n/a-n/a
    Type of Medium: Online Resource
    ISSN: 0886-6236
    URL: Article
    DOI: 10.1029/2002GB002004
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2003
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  • 7
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    Nitrification in the euphotic zone as evidenced by nitrate dual isotopic composition: Observations from Monterey Bay, California : NITRATE ISOTOPES IN MONTEREY BAY
    American Geophysical Union (AGU) ; 2007
    In:  Global Biogeochemical Cycles Vol. 21, No. 2 ( 2007-06), p. n/a-n/a
    Details
    In: Global Biogeochemical Cycles, American Geophysical Union (AGU), Vol. 21, No. 2 ( 2007-06), p. n/a-n/a
    Type of Medium: Online Resource
    ISSN: 0886-6236
    URL: Article
    DOI: 10.1029/2006GB002723
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2007
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  • 8
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    Temperature‐nitrate relationships in the central and eastern tropical Pacific
    American Geophysical Union (AGU) ; 1996
    In:  Journal of Geophysical Research: Oceans Vol. 101, No. C9 ( 1996-09-15), p. 20553-20563
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 101, No. C9 ( 1996-09-15), p. 20553-20563
    Abstract: The relationship between temperature and nitrate in the upper 200 m of the central and eastern tropical Pacific was investigated using regression techniques, and the slope of this relationship was compared along spatial and temporal dimensions. In the open‐ocean waters of the eastern and central Pacific, variation in the slope of the temperature‐nitrate (TN) relationship was primarily north‐south, with the steepness of the slope decreasing to the south. In the more coastal waters of the southeastern Pacific, however, the slope showed strong gradients in the east‐west direction, with the slope steepening from west to east. Seasonal trends in the slope of the TN relationship were examined along the equator. During March–May the relatively flat slope of the TN relationship that is found year‐round in the central Pacific is found to extend further east, associated with the intensification and shoaling of the Equatorial Undercurrent during this same period. Regressions predicting nitrate from temperature were tested on new data and errors of prediction were low for open‐ocean locations (1.4 μ M ); however, errors increased (to 3.2–4.3 μ M ) with proximity to coastal waters, reflecting the increasing and variable contribution of nitrate uptake by phytoplankton.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/96JC01943
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1996
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  • 9
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    Standing stocks of particulate carbon and nitrogen in the equatorial Pacific at 150°W
    American Geophysical Union (AGU) ; 1992
    In:  Journal of Geophysical Research: Oceans Vol. 97, No. C1 ( 1992-01-15), p. 655-661
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 97, No. C1 ( 1992-01-15), p. 655-661
    Abstract: In March 1988 a north‐south transect at longitude 150°W was carried out in the equatorial Pacific between latitude 15°N and 15°S. Observations of suspended particulate matter in the euphotic zone included particulate carbon, nitrogen, and chlorophyll, with a few samples taken for counting picoplankton and nanoplankton. Nearly all the particulate nitrogen is accounted for by bacteria and phytoplankton. The standing stock of bacterial C and N exceeded that of phytoplankton. The residence time of particulate organic carbon in the surface water was only 4–5 days in the equatorial upwelling, but 10–15 days to the north and south, suggesting relatively rapid removal by recycling and lateral advection.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/91JC01386
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1992
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  • 10
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    Physical‐biological synchrony in the global ocean associated with recent variability in the central and western equatorial Pacific
    American Geophysical Union (AGU) ; 2013
    In:  Journal of Geophysical Research: Oceans Vol. 118, No. 8 ( 2013-08), p. 3782-3794
    Details
    In: Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 118, No. 8 ( 2013-08), p. 3782-3794
    Abstract: The second global EOF mode in physics and biology is related to ENSO Modoki The integrated global‐scale impacts of this mode and ENSO Modoki are very weak Main drivers of biological variability are circulation and barrier layer changes
    Type of Medium: Online Resource
    ISSN: 2169-9275 , 2169-9291
    URL: Issue
    URL: Article
    DOI: 10.1002/jgrc.v118.8
    DOI: 10.1002/jgrc.20278
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2013
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