impact of changing siberian land-shelf-basin on the arctic ... · marine biogeochemical dynamics....
TRANSCRIPT
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Impact of changing Siberian land-shelf-basin
on the Arctic Ocean biogeochemical dynamics
PI: Shigeto Nishino (JAMSTEC)
Co-PI: Igor Semiletov (IARC/UAF)
Other Investigators: Natalia Shakhova (IARC/UAF), Ana Aguilar-Islas (SFOS/UAF),
Robert Rember (IARC/UAF), Meibing Jin (IARC/UAF),
Naomi Harada (JAMSTEC), Katsunori Kimoto (JAMSTEC),
Jo Onodera (JAMSTEC), and Takashi Kikuchi (JAMSTEC)
R/V Mirai
CO2, CH4
Russian vessel
Trace metal
IB Oden
?
Permafrost thawing
Coastal erosion
Drilling
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Why Siberian Arctic?
Data are lacking because of Russian EEZ,
but it is an important area for the Arctic Ocean biogeochemical dynamics.
Subsea permafrost thawing, coastal erosion and reduction of sea ice
induced by global warming are key processes.
R/V Mirai
CO2, CH4
Russian vessel
Trace metal
IB Oden
?
Permafrost thawing
Coastal erosion
Drilling
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1. Scientific background
More than 80% of the ocean
subsea permafrost is in the
East Siberian Arctic Shelf
(ESAS).
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Subsea permafrost thawing
Summertime observations of dissolved CH4 and
fluxes of CH4 venting to the atmosphere.
Shakhova et al. (2010a, b)Detection of methane ebullition (left) using the lander
(right) equipped with the multi-beam sonar.
– methane emission into the atmosphere
– possible positive feedback in global warming
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Coastal erosion
Surface distribution of a) suspended particular
materials (mg l-1): 1) <2, 2) 2-12, 3) 13-24, 4) >24;
b) contribution of terrestrial OM to POC (%): 1)
<25, 2)25-49, 3)50-75, 4) >75.
Semiletov et al. (2011, 2012, 2013)
– dominating role in Siberian shelf sedimentation
– Influencing carbon and nutrient cycles
– Influencing light condition for biological production
- Rates of coastal erosion can be up to 25 m/yr and higher.
- The secondary role of the Lena River and the dominating role of
coastal erosion in ESAS sedimentation.
Photo: Igor Semiletov
Lena
Laptev Sea
East Siberian
Sea
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2002/2003
DynHt [dyn m] and nitrate [μmol/kg] at 50 m
2008/2009
DynHt [dyn m] and nitrate [μmol/kg] at 50 m
Decrease of nuts
2002/2003
Chl-a [μg/L] (>10μm)
2008/2009
Chl-a [μg/L] (>10μm)
Decrease of export production
Increase of nuts
Enhancement of ocean circulation
Nishino et al. (2011b, 2013)
2008
Increase of export production
Nitrate [μmol/kg]
2002
Nitrate [μmol/kg]
Reduction of sea ice and changes in biological production
- In the Alaskan Arctic, nutrient decrease resulted in the decrease of export production.
- In the Siberian Arctic, nutrient increase is expected to increase the export production.
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Subtheme 1: Carbon, nutrient and trace metal cycling
and transports in the Siberian land-
shelf-basin continuum (joint cruises of
R/V Mirai and Russian vessels).
Subtheme 2: Seasonal changes in biogeochemical
cycles (combination of IARC winter ice
camps, JAMSTEC moorings and
sediment traps).
Subtheme 3: Contribution of Siberian Arctic to pan-
Arctic and global climate (development
and improvement of the integrated
biogeochemical models).
2. Research plans
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R/V Mirai
CO2, CH4
Russian vessel
Trace metal
IB Oden
?
Permafrost thawing
Coastal erosion
Drilling
Data are lacking in
the Russian EEZ area.
Collaboration with
Russian scientists
in IARC is needed.
Subtheme 1: Carbon, nutrient and trace metal cycling
and transports in the Siberian land-
shelf-basin continuum (joint cruises of
R/V Mirai and Russian vessels).
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Challenges and Concerns
• Data integration and joint cruises of R/V Mirai and Russian vessels are needed to understand Siberian arctic land–shelf–basin implications on marine biogeochemical dynamics.
• The Siberian Arctic Ocean is a target area for future biogeochemical and ecological studies because the area is expected to dramatically change in biogeochemical cycles and biological production with the subsea permafrost thawing, coastal erosion, and sea ice reduction.
Stations of Russian vessels (2003-2010)
Stations of R/V Mirai and
US&Canadian icebreakers
(2002-2010)
From Semiletov, I., and N. Shakhova From Nishino et al. (2013)
Joint cruise
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Subtheme 2: Seasonal changes in biogeochemical
cycles (combination of IARC winter ice
camps, JAMSTEC moorings and
sediment traps).
JAMSTEC sediment trapIARC winter ice camp
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Micro-focus X-ray CT (MXCT) technology
(photos by Dr. Kimoto, K.)
Bottom-tethered mooring
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CT number of Pteropods in NAP-10t sediment trap
Kimoto, K. (personal communication)
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Seawater chemistry along the Arctic 75ºN line
from the R/V Mirai cruise in 2010
Need data from Siberian shelf influenced by coastal erosion and acidification!
From Siberian shelf?
Terrestrial OM decay?
Low shell density sites
From Siberian shelf?
Kimoto, K. (personal communication)
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Subtheme 3: Contribution of Siberian Arctic to pan-
Arctic and global climate (development
and improvement of the integrated
biogeochemical models).
Coupled global ice-ocean-ecosystem model (Jin et al., 2012)
Model sensitivity studies will be
conducted to synthesize the
effects on marine biogeochemical
dynamics caused by permafrost
thawing, coastal erosion and sea
ice decrease in the Siberian Arctic
Ocean using coupled global ice-
ocean-ecosystem model (e.g., Jin
et al., 2012).
Subsea permafrost model (Nicolsky et al., 2012)
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3. Contributions toresearch communities
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- R/V Mirai and Russian vessels will be operated in collaboration with U.S.,
Canada, and other countries activities in the Arctic Ocean. Pacific Arctic
Group (PAG), which is organized under the International Arctic Science
Committee (IASC), serves as a Pacific Arctic regional partnership to plan,
coordinate, and collaborate on science activities.
AlaskaSiberia
Chukchi Sea
Canada Basin
Russia
Russia
Canada
SwedenJapan
USA
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- This study will provide the Japanese community with Arctic research
advantage through the participation in R/V Mirai and Russian vessel cruises
that will foment opportunities for field experiments in the Siberian Arctic
Ocean as well as the sharing of information from this undersampled region.
Satellite remote sensing
of primary productivity
Microbes and carbon cycle
in the Arctic Ocean
Units: GtC or
GtC/year
Differences in zooplankton between the east and west of Chukchi Plateau
Chiba, S. (personal communication)