Skip to main content
×
×
Home

Δ14C and Δ13C of Seawater DIC as Tracers of Coastal Upwelling: A 5-Year Time Series from Southern California

  • Guaciara M Santos (a1), Julie Ferguson (a1), Karla Acaylar (a1), Kathleen R Johnson (a1), Sheila Griffin (a1) and Ellen Druffel (a1)...
Abstract

Marine radiocarbon (14C) is a widely used tracer of past ocean circulation, but very few high-resolution records have been obtained. Here, we report a time series of carbon isotope abundances of dissolved inorganic carbon (DIC) in surface seawater collected from the Newport Beach pier in Orange County, within the Southern California Bight, from 2005 to 2010. Surface seawater was collected bimonthly and analyzed for Δ14C, δ13C, and salinity. Results from May 2005 to November 2010 show no long-term changes in δ13C DIC values and no consistent variability that can be attributed to upwelling. Δ14C DIC values have lowered from ∼34‰ to about ∼16‰, an 18‰ decrease from the beginning of this project in 2005, and is consistent with the overall 14C depletion from the atmospheric thermonuclear bomb pulse at the end of the 1950s. Δ14C DIC values, paired with salinity, do appear to be suitable indicators of upwelling strength with periods of upwelling characterized by more saline and lower DIC Δ14C values. However, a similar signal was not observed during the strong upwelling event of 2010. These results were obtained in the Southern California Bight where upwelling is fairly weak and there is a complex occanographic circulation in comparison with the remaining western USA coastline. It is therefore likely that the link between DIC Δ14C, salinity, and upwelling would be even stronger at other sites. These data represent the longest time series of Δ14C data from a coastal Southern California site performed to date.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Δ14C and Δ13C of Seawater DIC as Tracers of Coastal Upwelling: A 5-Year Time Series from Southern California
      Available formats
      ×
      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Δ14C and Δ13C of Seawater DIC as Tracers of Coastal Upwelling: A 5-Year Time Series from Southern California
      Available formats
      ×
      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Δ14C and Δ13C of Seawater DIC as Tracers of Coastal Upwelling: A 5-Year Time Series from Southern California
      Available formats
      ×
Copyright
Corresponding author
Corresponding author. Email: gdossant@uci.edu.
References
Hide All
Bakun, A. 1973. Coastal upwelling indices, west coast of North America. US Department of Commerce, NOAA Technical Report, NMFS SSRF–671.
Bjorkstedt, E, Goericke, R, McClatchie, S, Weber, E, Watson, W, Lo, N, Peterson, B, Emmett, B, Peterson, J, Durazo, R, Gaxiola-Castro, G, Chavez, F, Pennington, JT, Collins, CA, Field, J, Ralston, S, Sakuma, K, Bograd, S, Schwing, F, Xue, Y, Sydeman, W, Thompson, SA, Santora, JA, Largier, J, Halle, C, Morgan, S, Kim, SY, Merkens, K, Hildebrand, J, Munger, L. 2010. State of the California Current 2009–2010: regional variation persists through transition from La Niña to El Niño (and back?). California Cooperative Oceanic Fisheries Investigations Report 51:3969.
Bograd, SJ, Lynn, RJ. 2001. Physical-biological coupling in the California Current during the 1997–99 El Niño-La Niña cycle. Geophysical Research Letters 28(2):275–8.
Bograd, SJ, Schroeder, I, Sarkar, N, Qiu, X, Sydeman, WJ, Schwing, FB. 2009. Phenology of coastal upwelling in the California Current. Geophysical Research Letters 36: L01602, doi::10.1029/2008GL035933.
Brodeur, RD, Ralston, S, Emmett, RL, Trudel, M, Auth, TD, Phillips, AJ. 2006. Anomalous pelagic nekton abundance, distribution, and apparent recruitment in the northern California Current in 2004 and 2005. Geophysical Research Letters 33: L22S08, doi:10.1029/2006GL026614.
Chavez, FP, Pennington, JT, Castro, CG, Ryan, JP, Michisaki, RP, Sclining, B, Walz, P, Buck, KR, MacFadyen, A, Collins, CA. 2002. Biological and chemical consequences of the 1997–1998 El Niño in central California waters. Progress in Oceanography 54(1–4):205–32.
Chhak, K, Di Lorenzo, E. 2007. Decadal variations in the California Current upwelling cells. Geophysical Research Letters 34: L14604, doi::10.1029/2007GL030203.
DiGiacomo, PM, Holt, B. 2001. Satellite observations of small coastal ocean eddies in the Southern California Bight. Journal of Geophysical Research 106(C10):521–43.
Hickey, BM. 1979. The California Current system – hypotheses and facts. Progress in Oceanography 8(4):191279.
Hinger, EN, Santos, GM, Druffel, ERM, Griffin, S. 2010. Carbon isotope measurements of surface seawater from a time-series site off Southern California. Radiocarbon 52(1):6989.
Jenkins, WJ, Elder, KL, McNichol, AP, von Reden, K. 2010. The passage of the bomb radiocarbon pulse into the Pacific Ocean. Radiocarbon 52(3):1182–90.
Legaard, KR, Thomas, AC. 2006. Spatial patterns in seasonal and interannual variability of chlorophyll and sea surface temperature in the California Current. Journal of Geophysical Research 111: C06032, doi::10.1029/2005JC003282.
Legaard, KR, Thomas, AC. 2007. Spatial patterns of intraseasonal variability of chlorophyll and sea surface temperature in the California Current. Journal of Geophysical Research 112: C09006, doi::10.1029/2007JC004097.
Lynn, RJ, Simpson, JJ. 1987. The California Current system: the seasonal variability of its physical characteristics. Journal of Geophysical Research 92(C12):12,94766.
Lynn, RJ, Schwing, FB, Hayward, TL. 1995. The effect of the 1991–1993 ENSO on the California Current system. California Cooperative Oceanic Fisheries Investigations Reports 36:5771.
Massielo, CA, Druffel, ERM, Bauer, JE. 1998. Physical controls on dissolved inorganic radiocarbon variability in the California Current. Deep-Sea Research II 45:617–42.
McClatchie, S, Goericke, R, Schwing, FB, Bograd, SJ, Peterson, WT, Emmett, R, Charter, R, Watson, W, Lo, N, Hill, K, Collins, C, Kahru, M, Mitchell, BG, Koslow, JA, Gomez-Valdes, J, Lavaniegos, BE, Gaxiola-Castro, G, Gottschalk, J, L'Heureux, M, Xue, Y, Manzano-Sarabia, M, Bjorkstedt, E, Ralston, S, Field, J, Rogers-Bennett, L, Munger, L, Campbell, G, Merkens, K, Camacho, D, Havron, A, Douglas, A, Hildebrand, J. 2009. The state of the California Current, Spring 2008–2009: cold conditions drive regional differences in coastal production. California Cooperative Oceanic Fisheries Investigations Report 50:4368.
McNaught, AD, Wilkinson, A. 1997. Compendium of Chemical Terminology. 2nd edition. Oxford: Blackwell Scientific.
McNichol, AP, Jones, GA, Hutton, DL, Gagnon, AR, Key, RM. 1994. The rapid preparation of seawater ΣCO2 for radiocarbon analysis at the National Ocean Sciences AMS Facility. Radiocarbon 36(2):237–46.
Robinson, SW. 1981. Natural and man-made radiocarbon as a tracer for coastal upwelling processes. In: Richards, FA, editor. Coastal Upwelling. Washington, DC: American Geophysical Union. p 298–302.
Santos, GM, Southon, JR, Druffel-Rodriguez, KC, Griffin, S, Mazon, M. 2004. Magnesium perchlorate as an alternative water trap in AMS graphite sample preparation: a report on sample preparation at the KCCAMS Facility at the University of California, Irvine. Radiocarbon 46(1):165–73.
Santos, GM, Moore, RB, Southon, JR, Griffin, S, Hinger, E, Zhang, D. 2007. Technical progress in AMS 14C sample preparation at KCCAMS Facility: status report and performance of small samples. Radiocarbon 49(2):255–69.
Sheu, DD, Lee, WY, Wang, CH, Wei, CL, Chen, CTA, Cherng, C, Huang, MH. 1996. Depth distribution of δ13C of dissolved CO2 in seawater off eastern Taiwan: effects of Kuroshio current and its associated upwelling phenomenon. Continental Shelf Research 16(12):1609–19.
Stuvier, M, Polach, H. 1977. Discussion: reporting of 14C data. Radiocarbon 19(3):355–63.
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Radiocarbon
  • ISSN: 0033-8222
  • EISSN: 1945-5755
  • URL: /core/journals/radiocarbon
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed