ESTIMATION OF REGIONAL SOURCES AND SINKS OF CO2 USING MIXING RATIO DATA FROM THE RING OF TOWERS ...
Description:
The WLEF TV tower in northern Wisconsin is instrumented to take continuous
measurements of CO2 mixing ratio at 6 levels from 11 to 396m. During
the spring and summer of 2004 additional CO2 measurements were
deployed on five 76 m communication towers forming a ring around the WLEF tower
with a 100-150 km radius.
Author's Names: M. Uliasz, A. S. Denning, A. Schuh, K. J. Davis, et al
Filesize: 39.29 Kb
Added on: 08-Aug-2005 Downloads: 30
Home Page | Comment on Proceeding | Details
PERFORMANCE ANALYSIS OF THE LOFLO CONTINUOUS CO2 ANALYSER: MONITORING OF BASELINE AND ...
Description: Results are presented
from recent evaluations of multiple “LoFlo” CO2 analysers. These
experiments were conducted at both an urban site (Aspendale, a suburb of Melbourne, Australia),
and the Cape Grim baseline site. Figure 1 shows the
preliminary results from an overlap experiment involving two LoFlo analysers (identified
here as LoFlo-2A, and LoFlo-2B, each one operating with its own suite of
calibration gases) measuring marine boundary layer air from a shared single air
intake at the Cape Grim Baseline Air Pollution Station, in northwest Tasmania,
during April/May 2005. The figure shows the differences between hourly CO2
values from the two analysers, during those periods when baseline conditions
were experienced. The seven high pressure, CO2-in-dry air
calibration standards used for the LoFlo-2B system have been calibrated at the Carbon
Cycle Gases Group (CCGG), United States National Oceanic and Atmospheric
Administration (NOAA), Climate Monitoring and Diagnostics Laboratory (CMDL),
designated by the World Meteorological Organization (WMO) as the CO2
Central Calibration Laboratory.
Author's Names: M.V. van der Schoot, L.P. Steele, R.J. Francey, et al
Filesize: 160.26 Kb
Added on: 08-Aug-2005 Downloads: 48
Home Page | Comment on Proceeding | Details
TALL TOWER OBSERVATIONS OF GREENHOUSE GASES IN EUROPE: POSSIBILITIES FOR EMISSION VERIFICATION
Description: In the CHIOTTO project
(http://www.chiotto.org) as part of the CarboEurope cluster of projects
(http://www.carboeurope.org) a network of 8 tall tower stations has been set up
in Europe. Most towers are equipped for
continuous high precision measurements of ambient CO2, CH4,
CO and SF6. Some stations are also equipped for continuous
measurement of 222Rn and flask sampling. First measurement results
are presented and evaluated using forward and inverse model calculations.
Author's Names: A.T. Vermeulen, the CHIOTTO Team, and G. Pieterse
Filesize: 132.93 Kb
Added on: 08-Aug-2005 Downloads: 18
Home Page | Comment on Proceeding | Details
CARBOOCEAN – A EUROPEAN INTEGRATED PROJECT ON OCEAN CARBON SOURCES AND SINKS
Description:
The
CARBOOCEAN consortium aims at an accurate scientific assessment of the marine
carbon sources and sinks within space and time. It will determine the ocean’s quantitative role for
uptake of atmospheric carbon dioxide (CO2), the most important
manageable driving agent for climate change. Since
the ocean has the most significant overall potential as a sink for
anthropogenic CO2, the
correct quantification of this sink is a fundamental necessary condition for
all realistic prognostic climate simulations. Target is to reduce the present uncertainties in the quantification of
net annual air-sea CO2 fluxes by a factor of 2 for the world ocean
and by a factor of 4 for the Atlantic Ocean.
Author's Names: A.N.A. Volbers, C. Heinze, and the CARBOOCEAN Consortium
Filesize: 33.99 Kb
Added on: 08-Aug-2005 Downloads: 24
Home Page | Comment on Proceeding | Details
THE SIGNALS FROM SYNOPTIC CO2 VARIABILITY AND LOCAL ECOSYSTEM - A CASE STUDY
Description:
With the increasing temporal
and spatial density of CO2 flux and concentration observations from
worldwide tower networks, the importance of interpreting the data is becoming
more conspicuous. Previous work shows that tower observations might be able to
catch synoptic, regional, and local signals of CO2 simultaneously.
Thus a study that can explain CO2 transport and the response of the
ecosystem to the weather change simultaneously is necessary and will help the
development of the regional inverse modeling technique in the future.
Author's Names: J.-W. Wang, A. S. Denning, L. Lu, I. T. Baker, et al
Filesize: 156.03 Kb
Added on: 08-Aug-2005 Downloads: 24
Home Page | Comment on Proceeding | Details
DECADAL CHANGES IN INORGANIC CARBON IN THE ATLANTIC OCEAN
Description:
Changes in dissolved inorganic carbon (DIC) and
apparent oxygen utilization (AOU) in the water column are quantified for
meridional hydrographic sections through the Atlantic
from 63 ˚N to 60 ˚S between 1988/1993 and 2003/2005. Changes are most pronounced in the upper 1000
m water column. DIC changes range from
-5 to 40 µmol/kg and AOU changes by a similar amount. The remainder is caused by changes in
positions of fronts, gyres, remineralization and ventilation as manifested by
changes in watermass properties. In
particular AOU increases of similar magnitude as increases in DIC point towards
a significant contribution of oxidation of organic matter to the DIC
increase. The large changes in
biogeochemical properties of the upper water column of the Atlantic
have been one of the big surprises in the decadal reoccupation of the
transects.
Author's Names: R. Wanninkhof, S. Doney, C. Langdon, J. L. Bullister, et al
Filesize: 132.81 Kb
Added on: 08-Aug-2005 Downloads: 19
Home Page | Comment on Proceeding | Details
INITIAL RESULTS FROM THE TOTAL CARBON COLUMN OBSERVING NETWORK
Description:
The
Total Carbon Column Observing Network is a new network of ground-based solar
observatories, dedicated to column measurements of greenhouse gases. We present CO2 column abundances
observed in Park Falls, Wisconsin
and Lauder, New Zealand
during May 2004 – June 2005. In Park Falls, Wisconsin,
the peak-to-peak variation of column-average CO2 is approximately 13
ppmv. In Lauder, New Zealand, the peak-to-peak
variation of column-average CO2 is approximately 4 ppmv. Assuming a secular trend of 2 ppmv yr-1,
we infer a peak-to-peak seasonal amplitude of 11 ppmv and 2 ppmv for Park Falls
and Lauder respectively. These values
are higher than model predictions by Olsen and Randerson [2003].
Author's Names: R.A. Washenfelder, V. Sherlock, B.J. Connor, et al
Filesize: 269.01 Kb
Added on: 08-Aug-2005 Downloads: 109
Home Page | Comment on Proceeding | Details
ANTHROPOGENIC CO2 IN THE OCEANS ESTIMATED USING TRANSIT-TIME DISTRIBUTIONS
Description:
Quantifying
the uptake of anthropogenic carbon by the oceans is a crucial component of
understanding the global carbon cycle. Accordingly there has been considerable
research in the area, and recently global estimates of the inventory and
decadal uptake of anthropogenic carbon have been made using carbon measurements
[Sabine et al., 2004] and CFC
measurements [McNeil et al., 2003]. However, these methods introduce several
assumptions that may introduce systematic biases. In particular, both methods assume that
mixing plays a negligible role in the transport. Here we estimate the ocean uptake, inventory,
and distribution of anthropogenic carbon (Cant) in the oceans using
the transit-time distribution (TTD) method (see Hall et al. 2004, Waugh et al.
2004), which avoids the assumption of weak mixing.
Author's Names: D.W. Waugh , T.M. Hall, and B.I McNeil
Filesize: 71.36 Kb
Added on: 08-Aug-2005 Downloads: 27
Home Page | Comment on Proceeding | Details
A SIMULATION OF CARBON CYCLE EMPLOYED BY A 2-D ATMOSPHERIC TRANSPORT MODEL
Description:
Carbon flux distribution was
simulated between 90°S and 90°N during from 1981 to 1997. It was confirmed there was a terrestrial C
sink in the area of mid-high latitude of north hemisphere. Some effect factors
to Carbon flux, as ENSO, volcano
activity, surface temperature etc. were analyzed also.
Author's Names: L. Xu, C. Li, M. Shao, R.J. Zhang and M.A.K., Khalil
Filesize: 95.35 Kb
Added on: 09-Aug-2005 Downloads: 40
Home Page | Comment on Proceeding | Details
RETRIEVAL ALGORITHM OF CO2 COLUMN DENSITY BY USING SIMULATION DATA OF THE ‘GOSAT’ SWIR FTS UNDER
Description:
Greenhouse gases Observing SATellite (GOSAT) of Japan is planned to be launched in
2008. GOSAT will be equipped with a FTS to monitor CO2 column
density globally. The FTS has three near infrared bands which cover 0.76 µm, 1.6
µm, and 2.0 µm spectral regions, respectively. Retrieval algorithms to estimate
CO2 and CH4 column densities from these bands data are
now being developed. We have investigated retrieval algorithms under the
non-clear sky conditions. As one of these cases, a cirrus cloud parameter
estimation was researched. The cirrus vertical profile (i.e., existing height)
is estimated from the 0.76 µm band data. Strong water vapor absorption area is included
in the 2.0 µm spectral band, so that the reflected radiance from a ground
surface is absorbed completely by H2O in this area. Thus the signal
in this area is considered as path radiance caused by the cirrus clouds
reflection, because there is little water vapor above the cirrus cloud top. By
using this signal, the cirrus optical depth can be estimated, and then column
densities of CO2, CH4 and H2O are retrieved
precisely.
Author's Names: T. Yokota, A. Higurashi, T. Aoki, I. Morino, H. Oguma, et al
Filesize: 160.62 Kb
Added on: 09-Aug-2005 Downloads: 23
Home Page | Comment on Proceeding | Details