RECTIFIER EFFECT IN AN ATMOSPHERIC MODEL WITH DAILY BIOSPHERIC FLUXES
Description:
The synoptic scale atmosphere-biosphere interaction
can cause anomalies of ~10 ppm with length scale of ~1000 km in the monthly
averaged surface CO2 concentration. These anomalies may contribute
to the errors and uncertainties of CO2 inversion estimates.
Author's Names: M. Ishizawa, D. Chan, K. Higuchi, S. Maksyutov, et al
Filesize: 734.37 Kb
Added on: 28-Jul-2005 Downloads: 27
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AN INTERCOMPARISON OF THE DIURNAL AND SYNOPTIC BEHAVIOUR OF GLOBAL TRANSPORT MODELS
Description:
Over
the last decade the TransCom group has coordinated a number of
intercomparisons. The latest project focuses on the diurnal and synoptic
behaviour of transport models. The
poster will describe the experiment, introduce the participating models and
present a sample of preliminary results.
Author's Names: R. Law, W. Peters, C. Rödenbeck, L. Bruhwiler, et al
Filesize: 22.48 Kb
Added on: 01-Aug-2005 Downloads: 27
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INTERANNUAL VARIABILITY OF AIR-SEA CO2 FLUXES IN THE SOUTHERN OCEAN
Description:
The role of the Southern Ocean as a source or a
sink for CO2 in the modern ocean is heavily disputed, its
interannual variability is unknown, and its control on atmospheric CO2
during glaciations is suspected but still not understood nor quantified. We estimate the variability of the air-sea CO2
fluxes in the Southern Ocean for the 1992-2003 period using the spatio-temporal
distribution of atmospheric CO2 measurements from 12 stations in the
Southern Ocean and 43 stations worldwide.
Our results show basin-scale variability of ±0.1 to 0.3 PgC/y that are
related to physical variability in the Southern Ocean.
Author's Names: C. Le Quéré, C. Rödenbeck, E. T. Buitenhuis, et al
Filesize: 42.22 Kb
Added on: 01-Aug-2005 Downloads: 27
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EARTH SYSTEM RESPONSE TO GLOBAL WARMING INFERRED BY SIMULATION USING A ONE-DIMENSIONAL ENERGY ...
Description: The coupled feedback processes of energy
and carbon cycles are an essential mechanism for understanding global
environmental change. We developed a simplified one-dimensional
carbon and energy cycle coupled model to quantify the feedback processes between
energy and carbon cycles. The model was calibrated
to reproduce the historical variations in temperature and
atmospheric CO2 concentration. The model results of vertical ocean
temperature profiles, and latitudinal NPP and NEP
distributions were in good agreement with the observation data and terrestrial
biosphere model results. The regional difference of terrestrial ecosystem response by
climate feedback appeared in the middle and high latitudes. The north-south distribution
is important to investigate the terrestrial ecosystem because the opposite
response appeared in the middle and high latitude. The future change of carbon
cycle and climate was also simulated up to the year 2100 based on the IPCC
scenario. The atmospheric CO2 concentration reaches 735 ppmv in 2100
and global average temperature increases 1.9 K for 2000-2100.
Author's Names: K. Murakami, T.Sasai, K.Ichii, and Y.Yamaguchi
Filesize: 91.28 Kb
Added on: 02-Aug-2005 Downloads: 27
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RECENT CO2 FLUX VARIABILITY ESTIMATED FROM ATMOSPHERIC MIXING RATIO MEASUREMENTS – AN UPDATE
Description:
Regular multi-year
measurements of atmospheric CO2 mixing ratios at a network of sites
(Fig. 1) give quantitative spatial and temporal information on surface sources
and sinks [e.g., Conway et al., 1994]. Using a
global atmospheric tracer transport model in a high-resolution (daily, 4x5
degree pixels) inversion setup, we estimate surface-atmosphere CO2 fluxes
that give the best match between modelled and observed CO2 concentrations.
Building on an earlier study [Rödenbeck et al.,
2003], this contribution (1) presents new CO2 flux estimates using
methodological developments, and (2) provides an update on interannual fluxes over
the most recent anomalous time period 2002-2003.
Author's Names: C. Rödenbeck, T.J. Conway, R. Langenfelds, et al
Filesize: 261.71 Kb
Added on: 03-Aug-2005 Downloads: 27
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LARGE TEMPORAL AIR-SEA CO2 FLUX VARIATIONS IN THE SOUTHERN OCEAN SOUTH OF TASMANIA
Description: We analysed the temporal variations of the CO2
system in the Southern Ocean south of Tasmania and compared the seasonality of
the carbon dioxide fugacity (fCO2)
and the air-sea CO2 flux during spring and summer for two different
years: 1996/97 and 2002/03. In summer, the CO2 flux presents large
and contrasting interannual changes in the Permanent Open Ocean Zone (POOZ,
53-61°S): the oceanic CO2 sink varies from about –0.3 mmol.m-2.d-1
in 1997 to –20.6 mmol.m-2.d-1 in 2003. This strong sink in
February 2003 was related to an increased phytoplankton biomass in this
high-nutrient, low-chlorophyll (HNLC) region.
Author's Names: E. Brévière, A. Poisson, B. Tilbrook, N. Metzl, et al
Filesize: 75.17 Kb
Added on: 27-Jul-2005 Downloads: 26
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AN AUTONOMOUS, INEXPENSIVE, AND ROBUST CO2 ANALYZER
Description:
We
will present our design of a new autonomous, inexpensive, and robust CO2
analyzer (AIRCOA), a description of our quality control procedures, and data
examples from ongoing deployments. Our
current AIRCOA units require less than $10K (USD) in components, show
intercomparability better than 0.1 ppm during laboratory tests, and are
designed to run autonomously for months at a time.
Author's Names: B.B. Stephens, A. Watt, and G. Maclean
Filesize: 42.66 Kb
Added on: 04-Aug-2005 Downloads: 26
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ESTIMATING THE WORLD OCEAN AIR-SEA GAS EXCHANGE RATE USING BOMB 14C: REVISITED
Description: Wind-speed dependent bulk formulations of gas transfer
velocity have traditionally been scaled to the oceanic inventory of bomb 14C [1992, Wanninkhof and McGillis 1999) and average global wind speeds [Esbensen
and Kushnir 1981] . The recent advances in our ability to
estimate both the first two moments of global wind-speeds and the inventories
of bomb 14C
inventories call for a reanalysis of this anchor point as well as an
exploration of its implications on oceanic carbon uptake. We present a
reanalysis of the globally averaged air-sea transfer velocity of CO2
using an inverse calculation of bomb 14CO2 air-sea fluxes
from point measurements of 14C in the ocean interior and several
oceanic transport GCMs.
Author's Names: C. Sweeney, E. M. Gloor, A. R. Jacobson, R. M. Key, et al
Filesize: 127.05 Kb
Added on: 08-Aug-2005 Downloads: 26
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EXTENDING THE CO2 MONITORING NETWORK TO SPACE: THE NASA ORBITING CARBON OBSERVATORY MISSION
Description: Precise, global, space-based observations of
atmospheric CO2 would complement the measurements made by the
ground-based network and improve our understanding of CO2 sources
and sinks. NASA’s Orbiting Carbon Observatory (OCO) Mission is being developed to address this
need. OCO carries a high resolution grating spectrometer designed to measure
the near-infrared absorption by CO2 and molecular oxygen (O2)
in reflected sunlight. High resolution spectra taken in the CO2
bands near 1.61 and 2.06 mm provide constraints on the CO2 column
abundance, with the greatest information content near the surface.
Bore-sighted, high resolution spectra in the 0.76 mm O2 A-band
provide constraints on the surface pressure and atmospheric optical path
length.
Author's Names: D. Crisp and the OCO Science Team
Filesize: 167.11 Kb
Added on: 28-Jul-2005 Downloads: 25
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FIRST RESULTS FROM A 300 M TOWER ATMOSPHERIC MEASUREMENT STATION FOR GREENHOUSE ...
Description:
CHIOTTO – Continuous
HIgh-precisiOn Tall Tower Observations of greenhouse gases – is a European
Union-funded project which has as objective to build an
infrastructure for the continuous monitoring of greenhouse
gas concentrations across Europe above the surface layer using
tall towers (~300m height). For this purpose
a
new analysis system
for continuous atmospheric measurements was
built and tested at Max Planck Institute for Biogeochemistry, Jena,
Germany and was recently installed
at a 300 m tower
close to Bialystok, Poland (Lat 53°14'N, Long 23°01'E, Alt 180m),
as part of the “CHIOTTO”
tall tower network.
Since July
2005 this
system is measuring
quasi-continuously the atmospheric concentration of CO2,
CH4,
CO, N2O,
SF6
and the O2/N2
ratio as well as meteorological
parameters (atmospheric pressure,
temperature, humidity; wind speed and direction) from 5
heights on the tower ranging from 5 to 300 m.
The measurement devices
are: an
Oxzilla O2 fuel cell analyzer, a
LiCor 7000
NDIR CO2 analyzer, an
Agilent
gas chromatograph (GC) with flame ionization
detector (FID) and electronic
capture detector (ECD) for CH4, CO, N2O, SF6. The
challenge was to build a reliable automatic system which can run continuously
with very little maintenance and to fulfill at the
same time the high precision requirements for all the measured species prescribed
by the CHIOTTO project goals. The high
temporal resolution achieved will
capture
short
term events and diurnal variability. In addition, the
system is planned to run for at
least several years in order to observe long-term trends
as well.
We describe
the technical setup of the measurement system, the region of
influence of the station and present the first months of
data if available: correlations between species,
observed short term variability patterns and their relation to meteorology and
air parcel paths.
Author's Names: E.Popa, A.C.Manning, M.Gloor, U.Schultz, et al
Filesize: 19.85 Kb
Added on: 03-Aug-2005 Downloads: 25
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