Hansell and Bates Carbon and Nitrogen Variables

1
Hansell and BatesCarbon and Nitrogen Variables

• Carbon
• Total CO2 (TCO2 or DIC)
• Particulate organic carbon (POC)
• Dissolved organic carbon (DOC)
• Total Alkalinity (TA)

• Nitrogen
• Inorganic N (DIN) by HydroTeam
• Particulate organic nitrogen (PON)
• Total dissolved nitrogen (DINDON)
• Dissolved organic nitrogen (DON)

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Hansell and BatesCarbon and NitrogenResearch
Interests

• Distributions / hydrographic controls
• Transformations (dissolved to particulate
  inorganic to organic (net community production)
  remineralization, etc).
• Exchanges Transports (export as POM and DOM,
  shelf/basin exchange, sediment release, etc.)

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Hansell and BatesCarbon and Nitrogen
Spring
Summer
4
WHS Salinity DOC
Ice Melt Cap
Remnant River Water
Spring
Summer
Increased Salinity
and Decreased DOC
Or less freshwater from rivers so less DOC
5
Summer WHS
Bering Sea Winter Water
Observation Apparent conservative transport of
DOC across the shelf in Bering Sea Winter Water.
ca. 60 mM DOC.
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Barrow CanyonSummer
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Temp/Salinity Plots with DOC
Spring
Summer
Atlantic water
Eurasian basin shelf
Bering Sea winter water
Bering Sea summer water (Yukon R. water)
Remnant McKenzie R. water
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DOC vs Salinity(Depth in color)
Spring
Summer
Yukon R.
McK River
Ice Melt
Atlantic
Pacific
9
Bering Strait/Summer
MBS
YR
An
sMBS
wMBS
Sedimentary inputs of DON?
10
Summer Chukchi Shelf Nitrogen
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Issues

• Particulate vs dissolved organic matter export by
  various modes of transport
• Amount, timing, location and fate of
  sediment-released DOM
• Role of eddies formed in Barrow Canyon for
  shelf-basin exchange
• Role of winter dense water formation in DOM
  export to basin

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Summer Barrow Canyon Nitrogen