Presentation is loading. Please wait.

Presentation is loading. Please wait.

Chemical tracers of shelf derived waters in the Arctic Ocean

Published byMillicent Fields Modified over 8 years ago

Similar presentations

Presentation on theme: "Chemical tracers of shelf derived waters in the Arctic Ocean"— Presentation transcript:

1 Chemical tracers of shelf derived waters in the Arctic Ocean
NABOS Cruise Aug. – Sept. 2013 Matthew B. Alkire Polar Science Center Applied Physics Laboratory University of Washington

2 Some useful chemical tracers
Salinity Iodine-129 d18O O2 NO3 NO3:PO4

3 “Tracers” can help us to visualize and track changes in circulation
of separate water types Carmack et al. (2008)

4 sfc 1990 Karcher et al (2012) Smith et al. (1998)

5 sfc 2004 Karcher et al (2012)

6 RUSSIA USA Chukchi Sea East Siberian Sea Laptev Sea Kara Sea Greenland Barents Sea

7 Shelf Processes Modify waters on the shelf River runoff Sea ice
Nutrient cycling Modify waters on the shelf River runoff Sea ice Chemical fingerprints Carbon & nutrient cycling Carmack & Wassmann (2006)

8 Steele & Boyd (1998)

9 H218O versus H216O 16O > 18O  isotopically light
Water column (18O:16O) ice = 3:1, 16O 16O 16O 18O sea ice 18O 18O 16O 16O 16O freeze 16O 16O 18O 18O seawater + brine 16O 16O 18O melt 18O 18O 18O 18O brine: negative d18O (16O rich) sea ice: positive d18O (18O rich) (18O:16O)water = 1:1, (18O:16O) water ~ 1:2, 16O > 18O  isotopically light 18O > 16O  isotopically heavy

10 Where would you expect shelf waters to plot on this graph?
Atlantic water Sea-ice melt ice melt ice formation/ brine release Meteoric water (precip., river runoff, glacial melt)

11 Bauch et al. (2009)

12 Bauch et al. (2009)

13 Advantage of O2 & NO3? 106 CO2 + 16 HNO3 + H3PO4 + 78 H2O
= C106H175O42N16P O2 Advantage of O2 & NO3? Station 87°N, 180 (NPEO 2012)

14 Can you identify the shelf water signature? Alkire et al. (2010)

15 N2 fixation Mixing and/or convection? denitrification Redfield Air-sea exchange Station 87°N, 180 (NPEO 2012)

16 Canada Basin, 2008 What’s going on here?

17 A minimum in NO has classically been
NO = (9 x NO3) + O2 A minimum in NO has classically been used to identify lower halocline water Makarov Basin Amundsen Basin

18 Jones et al. (2003)

19 malkire@apl.washington.edu Questions? www.psc.apl.washington.edu
North Pole Environmental Observatory

20 Freshwater in the Arctic
River runoff Pacific inflow through Bering Strait Precipitation Glacial melt Groundwater

21 Nishino et al. (2013)

22 Itoh et al. (2007)

23 Convective or “Fram Strait
Branch” halocline water Advective or “Barents Sea Branch” halocline water Rudels et al. (2004)

24 Cyclonic years Anticyclonic years Yamamoto-Kawai et al. (2005)

25 How will this picture change
in the future?

26 What makes shelves special?
River runoff Sea ice formation (e.g., polynyas) Biological production Organic matter respiration Halocline formation Mixing Carbon

Download ppt "Chemical tracers of shelf derived waters in the Arctic Ocean"

Similar presentations

Jamie Morison Polar Science Center, University of Washington Bob Dickson CEFAS, U.K. Presentation NOClim/ProClim/AIO.

Jamie Morison Polar Science Center, University of Washington Bob Dickson CEFAS, U.K. Presentation NOClim/ProClim/AIO.
Supervisors: Dr. Leo Timokhov (AARI) Andrej Rubchenia Dr. Vladimir Pavlov (NPI) Long-period variability of thermohaline structure and circulation of water.

Supervisors: Dr. Leo Timokhov (AARI) Andrej Rubchenia Dr. Vladimir Pavlov (NPI) Long-period variability of thermohaline structure and circulation of water.
Temperature and salinity variability of the Atlantic Water in the Eastern Eurasian Basin between 1991 and 2011 Meri Korhonen R/V Akademik Fedorov, August.

Temperature and salinity variability of the Atlantic Water in the Eastern Eurasian Basin between 1991 and 2011 Meri Korhonen R/V Akademik Fedorov, August.
Discussion about two papers concerning the changing Arctic sea ice GEO6011Seminar in Geospatial Science and Applications Wentao Xia 11/19/2012.

Discussion about two papers concerning the changing Arctic sea ice GEO6011Seminar in Geospatial Science and Applications Wentao Xia 11/19/2012.
AS 91413 Year 13 SCIENCE. Ocean systems – course topics 1. Ocean composition 2. Ocean circulation 3. The carbon cycle 4. Transport matter, energy – heat,

AS Year 13 SCIENCE. Ocean systems – course topics 1. Ocean composition 2. Ocean circulation 3. The carbon cycle 4. Transport matter, energy – heat,
Circulation in the “Freshwater Switchyard” of the Arctic Ocean Michael Steele Polar Science Center, APL/UW Peter Schlosser & Bill Smethie Lamont-Doherty.

Circulation in the “Freshwater Switchyard” of the Arctic Ocean Michael Steele Polar Science Center, APL/UW Peter Schlosser & Bill Smethie Lamont-Doherty.
OCN520 Fall 2009 Mid-Term #2 Review Since Mid-Term #1 Ocean Carbonate Distributions Ocean Acidification Stable Isotopes Radioactive Isotopes Nutrients.

OCN520 Fall 2009 Mid-Term #2 Review Since Mid-Term #1 Ocean Carbonate Distributions Ocean Acidification Stable Isotopes Radioactive Isotopes Nutrients.
Sea-ice & the cryosphere

Sea-ice & the cryosphere
Circulation in the Freshwater Switchyard of the Arctic Ocean Michael Steele, A. Heiberg, R. Andersen, W. Ermold Applied Physics Laboratory, University.

Circulation in the Freshwater Switchyard of the Arctic Ocean Michael Steele, A. Heiberg, R. Andersen, W. Ermold Applied Physics Laboratory, University.
Thermohaline Circulation

Thermohaline Circulation
Oceanography of the Beaufort Gyre: state and problems A. Proshutinsky, Woods Hole Oceanographic Institution Science and Education Opportunities for an.

Oceanography of the Beaufort Gyre: state and problems A. Proshutinsky, Woods Hole Oceanographic Institution Science and Education Opportunities for an.
Circulation in the “Freshwater Switchyard” of the Arctic Ocean Michael Steele Polar Science Center, APL/UW Peter Schlosser & Bill Smethie Lamont-Doherty.

Circulation in the “Freshwater Switchyard” of the Arctic Ocean Michael Steele Polar Science Center, APL/UW Peter Schlosser & Bill Smethie Lamont-Doherty.
Decadal to Centennial History of Lena River Discharge to the Arctic Ocean Principal Investigators: Eugeny B. Karabanov, Douglas F. Williams PhD. Candidates:

Decadal to Centennial History of Lena River Discharge to the Arctic Ocean Principal Investigators: Eugeny B. Karabanov, Douglas F. Williams PhD. Candidates:
Lecture 19 Redox Environments in the Oceans. Multi-colored sediments! What’s going on here???

Lecture 19 Redox Environments in the Oceans. Multi-colored sediments! What’s going on here???
Nordic Seas Region Water mass transformation and production of high-density water in the Barents Sea through cooling and brine rejection during ice freezing.

Nordic Seas Region Water mass transformation and production of high-density water in the Barents Sea through cooling and brine rejection during ice freezing.
Edge of the Arctic multiyear 83.2N, 62.0E on August 14, 2007 Some thoughts on sea ice retreat in 2007 Takashi Kikuchi (& Jun Inoue) Institute of.

Edge of the Arctic multiyear 83.2N, 62.0E on August 14, 2007 Some thoughts on sea ice retreat in 2007 Takashi Kikuchi (& Jun Inoue) Institute of.
Charge to the Working Group How well do we understand the 2007 sea ice extent minimum? (through modelling and data analysis including retrospective analyses.

Charge to the Working Group How well do we understand the 2007 sea ice extent minimum? (through modelling and data analysis including retrospective analyses.
Sea Level Change in the Russian Sector of the Arctic Ocean Andrey Proshutinsky and Richard Krishfield Woods Hole Oceanographic Institution, USA Igor Ashik.

Sea Level Change in the Russian Sector of the Arctic Ocean Andrey Proshutinsky and Richard Krishfield Woods Hole Oceanographic Institution, USA Igor Ashik.
Abigail Spieler Oral Examination Presentation March 28, 2005

Abigail Spieler Oral Examination Presentation March 28, 2005
Inputs to shelf seas- an overview Materials are introduced into coastal and shelf seas primarily through: rivers, atmosphere, groundwaters, ice processes.

Inputs to shelf seas- an overview Materials are introduced into coastal and shelf seas primarily through: rivers, atmosphere, groundwaters, ice processes.

Similar presentations

Ads by Google