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Spatial and Temporal Variability of ...

Davidson, Charles Woodruff.

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Spatial and Temporal Variability of Coastal Carbonate Chemistry in the Southern California Region.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Spatial and Temporal Variability of Coastal Carbonate Chemistry in the Southern California Region./
Author:	Davidson, Charles Woodruff.
Description:	46 p.
Notes:	Source: Masters Abstracts International, Volume: 54-05.
Contained By:	Masters Abstracts International54-05(E).
Subject:	Chemical oceanography. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1591920
ISBN:	9781321845198

Spatial and Temporal Variability of Coastal Carbonate Chemistry in the Southern California Region.
Davidson, Charles Woodruff.

Spatial and Temporal Variability of Coastal Carbonate Chemistry in the Southern California Region. - 46 p.

Source: Masters Abstracts International, Volume: 54-05.

Thesis (M.S.)--University of California, San Diego, 2015.

This item is not available from ProQuest Dissertations & Theses.

The objective of this study was to characterize temporal and spatial variability in near shore inorganic carbon chemistry in Southern California. To date, relatively little research has been conducted concerning seawater carbon chemistry in the near-shore environment (<2 miles from shore), and this study attempts to serve as a starting point to better understand the contemporary conditions and variability in this environment. Seawater samples were collected monthly for a one-year duration at 15 near-shore locations, encompassing sandy beaches, rocky beaches, and harbors or bays in the San Diego area. This approach was complemented by sampling from a boat along an offshore running transect in La Jolla Cove at 4 locations from the surface to 40m depth. Measurements of Dissolved Inorganic Carbon (DIC), Total Alkalinity (TA), Temperature, and Salinity were conducted. These measured parameters were used to calculate in situ pHSWS, aragonite saturation state (O-aragonite), pCO2, and air-sea CO2 flux at all locations where applicable. Sample locations were categorized, based on their localized environment, into three categories: beach/sand, beach/rock, and harbor/bay (Figure 1).

ISBN: 9781321845198Subjects--Topical Terms:

516760
Chemical oceanography.

Spatial and Temporal Variability of Coastal Carbonate Chemistry in the Southern California Region.
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020 $a 9781321845198
035 $a (MiAaPQ)AAI1591920
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100 1 $a Davidson, Charles Woodruff. $3 3187703
245 1 0 $a Spatial and Temporal Variability of Coastal Carbonate Chemistry in the Southern California Region.
300 $a 46 p.
500 $a Source: Masters Abstracts International, Volume: 54-05.
500 $a Adviser: Andreas Andersson.
502 $a Thesis (M.S.)--University of California, San Diego, 2015.
506 $a This item is not available from ProQuest Dissertations & Theses.
520 $a The objective of this study was to characterize temporal and spatial variability in near shore inorganic carbon chemistry in Southern California. To date, relatively little research has been conducted concerning seawater carbon chemistry in the near-shore environment (<2 miles from shore), and this study attempts to serve as a starting point to better understand the contemporary conditions and variability in this environment. Seawater samples were collected monthly for a one-year duration at 15 near-shore locations, encompassing sandy beaches, rocky beaches, and harbors or bays in the San Diego area. This approach was complemented by sampling from a boat along an offshore running transect in La Jolla Cove at 4 locations from the surface to 40m depth. Measurements of Dissolved Inorganic Carbon (DIC), Total Alkalinity (TA), Temperature, and Salinity were conducted. These measured parameters were used to calculate in situ pHSWS, aragonite saturation state (O-aragonite), pCO2, and air-sea CO2 flux at all locations where applicable. Sample locations were categorized, based on their localized environment, into three categories: beach/sand, beach/rock, and harbor/bay (Figure 1).
520 $a In general, we observed large spatial and temporal variability in DIC, TA, pHSWS, O- aragonite, pCO2, and CO2 flux. The highest variability, as well as the largest values in DIC and TA, occurred in stations categorized as bay/harbor. Stations categorized as beach/sand and beach/rock were less variable, although, compared to open ocean environments they still experienced large variability with averages of DIC ranging from +/-40 mumol kg-1 to +/-100 mumol kg-1 over the 12-month study period. Notably, we observed an overall region-wide decrease in TA that contributed to lower seawater pHSWS and O-aragonite during spring and summer. Calculated pCO2 and CO2 flux showed that the region acted as a source of CO 2 to the atmosphere, result that is consistent with previous studies, which have shown that inner continental shelves in general serve as sources of CO2 to the atmosphere. Low surface seawater pH and O-aragonite were occasionally observed at some of the stations (sometimes as low as 7.51 and 1.0, respectively), showing a worrying level of acidity not expected in the open ocean until the end of the next century. Similarly, the coastal offshore transect revealed shoaling of low seawater pH and O-aragonite in the spring and summer as a result of intensified upwelling during this time period. These observations show how coastal processes are likely to intensify the effects of ocean acidification in the coastal ocean with potential consequences to marine organisms sensitive to changes in seawater pH and O-aragonite.
520 $a In conclusion, this study provides key data showing that the near-shore environment is highly variable and on occasion experience seawater CO 2 conditions not expected in the open ocean until well into the future. It acts as starting point for further studies aiming to understand the complexity of the near-shore environments that is of major economic, ecologic, scientific, and social importance. general.
590 $a School code: 0033.
650 4 $a Chemical oceanography. $3 516760
650 4 $a Inorganic chemistry. $3 3173556
690 $a 0403
690 $a 0488
710 2 $a University of California, San Diego. $b Earth Sciences. $3 1035583
773 0 $t Masters Abstracts International $g 54-05(E).
790 $a 0033
791 $a M.S.
792 $a 2015
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1591920