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CiteuLike Searching for globalwarming awareness2007

Matching carbon pools and fluxes for the Southern Ocean Iron Release Experiment (SOIREE)

Fetched: October 2nd, 2007, 2:53pm CEST by Dorothee Bakker

Tags: [edit]

Deep Sea Research Part I: Oceanographic Research Papers, Vol. 53, No. 12. (December 2006), pp. 1941-1960.

The Lagrangian Southern Ocean Iron Release Experiment (SOIREE) allowed study of a gradually evolving iron-mediated phytoplankton bloom in water labelled with the inert tracer sulfur hexafluoride, SF6. This article describes a pelagic carbon budget for the mixed layer in SOIREE and assesses the extent to which closure of the budget is achieved. Net community production (NCP) converted 837 mmol m-2 of inorganic carbon to organic carbon in 12.0 d after the first iron addition. A large fraction (41%) of NCP remained as particulate organic carbon in the mixed layer of the iron-enriched patch, while 23% was lost by horizontal dispersion and 0-29% was exported. The closure of the carbon budget is hampered by the lack of measurements of dissolved organic carbon (DOC), by a major uncertainty in carbon export, and by use of empirical conversion factors in estimates of carbon biomass and metabolic rates. Lagrangian carbon-budget studies may be improved by direct measurement of all major carbon parameters and conversion factors. Carbon cycling in the SOIREE bloom resembled that in `natural' algal blooms in the open Southern Ocean in some respects, but not in all. Daily NCP in the SOIREE bloom (70 mmol m-2 d-1) was higher than in natural blooms, partly because other studies did not account for horizontal dispersion, were for longer periods or included less productive areas. The build-up of POC stock and carbon export as a fraction of NCP in SOIREE were in the lower range of observations elsewhere.
Clues from MIS 11 to predict the future climate - a modelling point of view

Fetched: October 2nd, 2007, 2:53pm CEST by MF Loutre

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Earth and Planetary Science Letters, Vol. 212, No. 1-2. (15 July 2003), pp. 213-224.

Simulations performed with the LLN two-dimensional Northern Hemisphere climate model have confirmed that climate is largely triggered by changes in insolation forcing although atmospheric CO2 concentration also plays an important role, in particular in the amplitude of the simulated variations. Marine isotope stage 11 (MIS 11) some 400 kyr ago and the future share a common feature related to climate forcing, i.e. the insolation at these times displays small similar variations. MIS 11 can be considered an analogue for future natural climate changes. Different simulations were performed to identify the conditions constraining the length of the MIS 11 simulated interglacial. Clearly its length strongly depends on the phase relationship between insolation and CO2 variations. It is only when insolation and CO2 act together towards a cooling, i.e. they both decrease together, that the climate enters quickly into glaciation and that the interglacial may be short. Otherwise each forcing alone is not able to drive the system into glaciation and the climate remains in an interglacial state. The same situation applies for the future. However, we already know that CO2 and insolation do not play together. Indeed, insolation has been decreasing since 11 kyr BP and CO2 concentration remains above 260 ppmv, with a general increasing trend over the last 8000 yr. Therefore we conclude that the long interglacial simulated for the future is a robust feature and the Earth will not enter naturally into glaciation before 50 kyr AP.
Impact of global dimming and brightening on global warming

Fetched: October 2nd, 2007, 2:53pm CEST by Martin Wild

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Geophysical Research Letters, Vol. 34 (20 February 2007), L04702.
How Much More Rain Will Global Warming Bring?

Fetched: October 2nd, 2007, 2:53pm CEST by Frank Wentz

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Science, Vol. 317, No. 5835. (13 July 2007), pp. 233-235.

Climate models and satellite observations both indicate that the total amount of water in the atmosphere will increase at a rate of 7% per kelvin of surface warming. However, the climate models predict that global precipitation will increase at a much slower rate of 1 to 3% per kelvin. A recent analysis of satellite observations does not support this prediction of a muted response of precipitation to global warming. Rather, the observations suggest that precipitation and total atmospheric water have increased at about the same rate over the past two decades. 10.1126/science.1140746
Climate change: Aerosols heat up

Fetched: October 2nd, 2007, 2:53pm CEST by Peter Pilewskie

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Nature, Vol. 448, No. 7153. (01 August 2007), pp. 541-542.
Warming trends in Asia amplified by brown cloud solar absorption

Fetched: October 2nd, 2007, 2:53pm CEST by Veerabhadran Ramanathan

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Nature, Vol. 448, No. 7153. (2007), pp. 575-578.
Warming trends in Asia amplified by brown cloud solar absorption

Fetched: September 19th, 2007, 11:56pm CEST by Veerabhadran Ramanathan

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Nature, Vol. 448, No. 7153. (2007), pp. 575-578.
Climate change: Aerosols heat up

Fetched: September 19th, 2007, 11:56pm CEST by Peter Pilewskie

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Nature, Vol. 448, No. 7153. (01 August 2007), pp. 541-542.
Climate change: Aerosols heat up

Posted: August 3rd, 2007, 2:15am CEST by Peter Pilewskie

Tags: [edit]

Nature, Vol. 448, No. 7153. (01 August 2007), pp. 541-542.
Warming trends in Asia amplified by brown cloud solar absorption

Posted: August 3rd, 2007, 2:15am CEST by Veerabhadran Ramanathan

Tags: [edit]

Nature, Vol. 448, No. 7153. (2007), pp. 575-578.
Matching carbon pools and fluxes for the Southern Ocean Iron Release Experiment (SOIREE)

Fetched: August 2nd, 2007, 11:54am CEST by Dorothee Bakker

Tags: [edit]

Deep Sea Research Part I: Oceanographic Research Papers, Vol. 53, No. 12. (December 2006), pp. 1941-1960.

The Lagrangian Southern Ocean Iron Release Experiment (SOIREE) allowed study of a gradually evolving iron-mediated phytoplankton bloom in water labelled with the inert tracer sulfur hexafluoride, SF6. This article describes a pelagic carbon budget for the mixed layer in SOIREE and assesses the extent to which closure of the budget is achieved. Net community production (NCP) converted 837 mmol m-2 of inorganic carbon to organic carbon in 12.0 d after the first iron addition. A large fraction (41%) of NCP remained as particulate organic carbon in the mixed layer of the iron-enriched patch, while 23% was lost by horizontal dispersion and 0-29% was exported. The closure of the carbon budget is hampered by the lack of measurements of dissolved organic carbon (DOC), by a major uncertainty in carbon export, and by use of empirical conversion factors in estimates of carbon biomass and metabolic rates. Lagrangian carbon-budget studies may be improved by direct measurement of all major carbon parameters and conversion factors. Carbon cycling in the SOIREE bloom resembled that in `natural' algal blooms in the open Southern Ocean in some respects, but not in all. Daily NCP in the SOIREE bloom (70 mmol m-2 d-1) was higher than in natural blooms, partly because other studies did not account for horizontal dispersion, were for longer periods or included less productive areas. The build-up of POC stock and carbon export as a fraction of NCP in SOIREE were in the lower range of observations elsewhere.
How Much More Rain Will Global Warming Bring?

Fetched: July 28th, 2007, 12:02pm CEST by Frank Wentz

Tags: [edit]

Science, Vol. 317, No. 5835. (13 July 2007), pp. 233-235.

Climate models and satellite observations both indicate that the total amount of water in the atmosphere will increase at a rate of 7% per kelvin of surface warming. However, the climate models predict that global precipitation will increase at a much slower rate of 1 to 3% per kelvin. A recent analysis of satellite observations does not support this prediction of a muted response of precipitation to global warming. Rather, the observations suggest that precipitation and total atmospheric water have increased at about the same rate over the past two decades. 10.1126/science.1140746
How Much More Rain Will Global Warming Bring?

Posted: July 12th, 2007, 11:29pm CEST by Frank Wentz

Tags: [edit]

Science, Vol. 317, No. 5835. (13 July 2007), pp. 233-235.

Climate models and satellite observations both indicate that the total amount of water in the atmosphere will increase at a rate of 7% per kelvin of surface warming. However, the climate models predict that global precipitation will increase at a much slower rate of 1 to 3% per kelvin. A recent analysis of satellite observations does not support this prediction of a muted response of precipitation to global warming. Rather, the observations suggest that precipitation and total atmospheric water have increased at about the same rate over the past two decades. 10.1126/science.1140746
Impact of global dimming and brightening on global warming

Fetched: March 3rd, 2007, 1:14am CET by Martin Wild

Tags: [edit]

Geophysical Research Letters, Vol. 34 (20 February 2007), L04702.
Clues from MIS 11 to predict the future climate - a modelling point of view

Fetched: March 3rd, 2007, 1:14am CET by MF Loutre

Tags: [edit]

Earth and Planetary Science Letters, Vol. 212, No. 1-2. (15 July 2003), pp. 213-224.

Simulations performed with the LLN two-dimensional Northern Hemisphere climate model have confirmed that climate is largely triggered by changes in insolation forcing although atmospheric CO2 concentration also plays an important role, in particular in the amplitude of the simulated variations. Marine isotope stage 11 (MIS 11) some 400 kyr ago and the future share a common feature related to climate forcing, i.e. the insolation at these times displays small similar variations. MIS 11 can be considered an analogue for future natural climate changes. Different simulations were performed to identify the conditions constraining the length of the MIS 11 simulated interglacial. Clearly its length strongly depends on the phase relationship between insolation and CO2 variations. It is only when insolation and CO2 act together towards a cooling, i.e. they both decrease together, that the climate enters quickly into glaciation and that the interglacial may be short. Otherwise each forcing alone is not able to drive the system into glaciation and the climate remains in an interglacial state. The same situation applies for the future. However, we already know that CO2 and insolation do not play together. Indeed, insolation has been decreasing since 11 kyr BP and CO2 concentration remains above 260 ppmv, with a general increasing trend over the last 8000 yr. Therefore we conclude that the long interglacial simulated for the future is a robust feature and the Earth will not enter naturally into glaciation before 50 kyr AP.

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CiteuLike Searching for globalwarming awareness2007

Matching carbon pools and fluxes for the Southern Ocean Iron Release Experiment (SOIREE)

Fetched: October 2nd, 2007, 2:53pm CEST by Dorothee Bakker

Tags: [edit]

Clues from MIS 11 to predict the future climate - a modelling point of view

Fetched: October 2nd, 2007, 2:53pm CEST by MF Loutre

Tags: [edit]

Impact of global dimming and brightening on global warming

Fetched: October 2nd, 2007, 2:53pm CEST by Martin Wild

Tags: [edit]

How Much More Rain Will Global Warming Bring?

Fetched: October 2nd, 2007, 2:53pm CEST by Frank Wentz

Tags: [edit]

Climate change: Aerosols heat up

Fetched: October 2nd, 2007, 2:53pm CEST by Peter Pilewskie

Tags: [edit]

Warming trends in Asia amplified by brown cloud solar absorption

Fetched: October 2nd, 2007, 2:53pm CEST by Veerabhadran Ramanathan

Tags: [edit]

Warming trends in Asia amplified by brown cloud solar absorption

Fetched: September 19th, 2007, 11:56pm CEST by Veerabhadran Ramanathan

Tags: [edit]

Climate change: Aerosols heat up

Fetched: September 19th, 2007, 11:56pm CEST by Peter Pilewskie

Tags: [edit]

Climate change: Aerosols heat up

Posted: August 3rd, 2007, 2:15am CEST by Peter Pilewskie

Tags: [edit]

Warming trends in Asia amplified by brown cloud solar absorption

Posted: August 3rd, 2007, 2:15am CEST by Veerabhadran Ramanathan

Tags: [edit]

Matching carbon pools and fluxes for the Southern Ocean Iron Release Experiment (SOIREE)

Fetched: August 2nd, 2007, 11:54am CEST by Dorothee Bakker

Tags: [edit]

How Much More Rain Will Global Warming Bring?

Fetched: July 28th, 2007, 12:02pm CEST by Frank Wentz

Tags: [edit]

How Much More Rain Will Global Warming Bring?

Posted: July 12th, 2007, 11:29pm CEST by Frank Wentz

Tags: [edit]

Impact of global dimming and brightening on global warming

Fetched: March 3rd, 2007, 1:14am CET by Martin Wild

Tags: [edit]

Clues from MIS 11 to predict the future climate - a modelling point of view

Fetched: March 3rd, 2007, 1:14am CET by MF Loutre

Tags: [edit]