AI012:
The influence of El Niño Southern Oscillation on biogeochemical cycling in eastern boundary upwelling system oxygen minimum zones and air-sea exchange in the overlying waters


Session ID#: 27615

Session Description:
Elevated surface productivity and subsequent subsurface remineralization typically result in eastern boundary upwelling systems (EBUS) being characterized by well-defined oxygen minimum zones (OMZs). As a principal determinant of redox state, oxygen availability plays an important role in regulating biogeochemical cycles. To this end, large perturbations to nutrient and climate active gas cycling are often observed in EBUS OMZs when compared to the oxygenated ocean, and the upwelling conditions in these regions can rapidly transport atmospherically relevant gases to the surface waters, creating sea-to-air gas flux hotspots. Depressed upwelling and deeper and less pronounced OMZs caused by El Niño conditions, can, however, cause periodic variability to the conditions that are typically observed in EBUS OMZs, as recently demonstrated by the ASTRA-OMZ cruise to the eastern tropical South Pacific OMZ in October 2015. To fully understand the role of EBUS OMZs for oceanic and atmospheric nutrient and dissolved gas budgets, it is important to consider these kinds of climatic variability. We welcome all submissions related to furthering our understanding of biogeochemical processes in EBUS OMZs and air-sea gas exchange in the overlying waters, but particularly encourage those which consider the impacts of periodic climate variability caused by El Niño events.
Primary Chair:  Christa A Marandino, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Co-chairs:  Damian Grundle, Bermuda Institute for Ocean Science, Bermuda and Tobias Steinhoff, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Index Terms:

4215 Climate and interannual variability [OCEANOGRAPHY: GENERAL]
4279 Upwelling and convergences [OCEANOGRAPHY: GENERAL]
4802 Anoxic environments [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4875 Trace elements [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
Cross-Topics:
  • BN - Biogeochemistry and Nutrients
  • CT - Chemical Tracers, Organic Matter and Trace Materials

Abstracts Submitted to this Session:

Mingshuang Sun1, Annette Kock2 and Hermann W Bange2, (1)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, (2)GEOMAR, Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Birgit Quack1, Sarah Gjermo2, Steffen Fuhlbruegge1, Alina Fiehn1, Irene Stemmler3, Elliot L Atlas4, Christa A Marandino5 and Kirstin Krüger6, (1)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, (2)UIO, Oslo, Norway, (3)Max Planck Institute for Meteorology, Hamburg, Germany, (4)RSMAS, Miami, FL, United States, (5)GEOMAR, Kiel, Germany, (6)University of Oslo, Oslo, Norway
Christa A Marandino1, Damian L. Arevalo-Martinez2, Alexander Zavarsky1, Hermann W Bange3, Tobias Steinhoff2 and Damian Grundle4, (1)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, (2)GEOMAR, Kiel, Germany, (3)GEOMAR, Helmholtz Centre for Ocean Research Kiel, Kiel, Germany, (4)Bermuda Institute for Ocean Science, Bermuda