February 02, 2009, at 08:31 PM by robin -

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(The old version of this page, abandoned January ‘09 can be found here)

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(The old version of this page, abandoned January ‘09 can be found here)

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I’m trying to keep up incrementally with new developments under the relevant subject headings, so check back on those specific pages and look for the changes (either in the Solution section, or at the top of the page) if you’re interested in a specific issue.

to:

I’m trying to keep up incrementally with new developments under the relevant subject headings, so check back on those specific pages and look for the changes (either in the Solution section, or at the top of the page) if you’re interested in a specific issue. Datestamps under the headings indicate the last modification time of that section. Any technical details refer to my filenames only - these may well be changed/combined with others in release versions.

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The old version of this page, abandoned January ‘09 can be found here

Datestamps under the headings indicate the last modification time of that section.

Any technical details refer to my filenames only - these may well be changed/combined with others in release versions.

to:

The old version of this page, abandoned January ‘09 can be found here.

February 02, 2009, at 08:29 PM by robin -

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(The old version of this page, abandoned January ‘09 can be found here)

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The old version of this page, abandoned January ‘09 can be found here

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February 02, 2009, at 08:20 PM by robin -

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I’m trying to keep up incrementally with new developments under the relevant subject headings, so check back on those specific pages and look for the changes (either in the Solution section, or at the top of the page) if you’re interested in a specific issue. Anything urgent will also be flagged up here.

to:

I’m trying to keep up incrementally with new developments under the relevant subject headings, so check back on those specific pages and look for the changes (either in the Solution section, or at the top of the page) if you’re interested in a specific issue.

February 02, 2009, at 08:17 PM by robin -

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Scientific Issues in FAMOUS

Updates

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Scientific Issues in FAMOUS

Updates

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Issue by issue

Cold bias

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Issue by issue

Cold bias

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Marine Biogeochemistry

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Marine Biogeochemistry

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Paleo Forcing Issues

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Paleo Forcing Issues

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MOSESII.2

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MOSESII.2

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Interactive CO2

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Interactive CO2

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About this page

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About this page

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Scientific Issues in FAMOUS

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Robin Smith

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Scientific Issues in FAMOUS

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Current Issues in FAMOUS

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Updates

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Dec. ‘08

update on the self_shade issue: doesn’t look like running with the old self_shade mod but without HadOCC (e.g. xcpsb) has any significant effect on the climate. One test run did show a small coupling shock at going from the broken→fixed parameterisation, but there was very little difference once the climate had settled down.

an interesting development in timestepping. Ron Kahana at Bristol has been running with two dynamic sweeps per timesteps in the atmosphere to help with stability. I’ve done some tests, and it turns out that this significantly affects the mean climate, cooling the tropics and warming the poles. It’s not really clear yet why. If used with the re-tuned ice albedoes of xcpsb and later, this gives you a rather large warm bias over the Arctic, compared to xcpsb/xdbua. Used with the original ice albedo values though, two sweeps seems to bring surface temperatures closer to those in HadCM3, and also improves northern hemisphere seasonality.

I’m continuing tests with lower isopycnal diffusion in the ocean, along with free-drifting ice. These two seem to help the Southern Ocean warm bias and increase AABW. The grand plan now is to (manually) tune the sea-ice again using these, along with the snow_on_ice bugfix (see July), and 2 dynamic sweeps in the atmosphere for a hopefully even better FAMOUS.

yes, it’s another BUG WARNING. MOSES1 FAMOUSes, up to and including xcpsa and xdbub, appear to have their grid box mean surface sensible heat and moisture fluxes swapped for ocean and coastal points at the end of SFFLUX5A.F. Surface climate affects appear to be pretty small, patches of cooling of around a degree in the northern hemisphere in winter. I’ve a new version of the coastal tiling mod ctile_09_new_param, that will be included in future releases, but I’m not planning to backdate it. As for the ancil bug below (see November), this isn’t an issue in MOSES2.

to:

Jan. ‘09

I’ve been looking up the whole “two dynamic sweeps per timestep” thing. It does definitely up the midlatitude EKE and increase the atmospheric heat transport - not entirely surprising, but it’s nice to know there’s some physics going on, rather than bad numerics.

February 02, 2009, at 07:56 PM by robin -

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If anyone’s actually reading this and would like to be able to track developments in a more obvious manner, let me know.

February 02, 2009, at 07:55 PM by robin -

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Recent updates

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Issue by issue

Cold bias

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Cold bias

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Marine Biogeochemistry

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Marine Biogeochemistry

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Paleo Forcing Issues

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Paleo Forcing Issues

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MOSESII.2

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MOSESII.2

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Interactive CO2

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Interactive CO2

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About this page

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About this page

February 02, 2009, at 07:52 PM by robin -

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I’m trying to keep up incrementally with new developments under the relevant subject headings, so check back on those specific pages and look for the changes (either in the Solution section, or at the top of the page) if you’re interested in a specific issue. Anything urgent will also be flagged up here.

Standard/Release version of FAMOUS have their own changelogs at FAMOUSStandardVersions.

Datestamps under the headings indicate the last modification time of that section.

Any technical details refer to my filenames only - these may well be changed/combined with others in release versions.

If anyone’s actually reading this and would like to be able to track developments in a more obvious manner, let me know.

r.s.smith at reading.ac.uk

Recent updates

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Recent updates

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Cold bias

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Issue by issue

Cold bias

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Marine Biogeochemistry

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Marine Biogeochemistry

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Paleo Forcing Issues

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Paleo Forcing Issues

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MOSESII.2

to:

MOSESII.2

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Interactive CO2

to:

Interactive CO2

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About this page

I’m trying to keep up incrementally with new developments under the relevant subject headings, so check back on those specific pages and look for the changes (either in the Solution section, or at the top of the page) if you’re interested in a specific issue. Anything urgent will also be flagged up here.

Standard/Release version of FAMOUS have their own changelogs at FAMOUSStandardVersions.

Datestamps under the headings indicate the last modification time of that section.

Any technical details refer to my filenames only - these may well be changed/combined with others in release versions.

If anyone’s actually reading this and would like to be able to track developments in a more obvious manner, let me know.

r.s.smith at reading.ac.uk

February 02, 2009, at 07:45 PM by robin -

Added lines 1-52:

Robin Smith

(February 02, 2009, at 08:31 PM)

Current Issues in FAMOUS

I’m trying to keep up incrementally with new developments under the relevant subject headings, so check back on those specific pages and look for the changes (either in the Solution section, or at the top of the page) if you’re interested in a specific issue. Anything urgent will also be flagged up here.

Standard/Release version of FAMOUS have their own changelogs at FAMOUSStandardVersions.

Datestamps under the headings indicate the last modification time of that section.

Any technical details refer to my filenames only - these may well be changed/combined with others in release versions.

If anyone’s actually reading this and would like to be able to track developments in a more obvious manner, let me know.

r.s.smith at reading.ac.uk

Recent updates

Dec. ‘08

update on the self_shade issue: doesn’t look like running with the old self_shade mod but without HadOCC (e.g. xcpsb) has any significant effect on the climate. One test run did show a small coupling shock at going from the broken→fixed parameterisation, but there was very little difference once the climate had settled down.

an interesting development in timestepping. Ron Kahana at Bristol has been running with two dynamic sweeps per timesteps in the atmosphere to help with stability. I’ve done some tests, and it turns out that this significantly affects the mean climate, cooling the tropics and warming the poles. It’s not really clear yet why. If used with the re-tuned ice albedoes of xcpsb and later, this gives you a rather large warm bias over the Arctic, compared to xcpsb/xdbua. Used with the original ice albedo values though, two sweeps seems to bring surface temperatures closer to those in HadCM3, and also improves northern hemisphere seasonality.

I’m continuing tests with lower isopycnal diffusion in the ocean, along with free-drifting ice. These two seem to help the Southern Ocean warm bias and increase AABW. The grand plan now is to (manually) tune the sea-ice again using these, along with the snow_on_ice bugfix (see July), and 2 dynamic sweeps in the atmosphere for a hopefully even better FAMOUS.

yes, it’s another BUG WARNING. MOSES1 FAMOUSes, up to and including xcpsa and xdbub, appear to have their grid box mean surface sensible heat and moisture fluxes swapped for ocean and coastal points at the end of SFFLUX5A.F. Surface climate affects appear to be pretty small, patches of cooling of around a degree in the northern hemisphere in winter. I’ve a new version of the coastal tiling mod ctile_09_new_param, that will be included in future releases, but I’m not planning to backdate it. As for the ancil bug below (see November), this isn’t an issue in MOSES2.

(more updates)

Main.CurrentWorkRobinNEW History

Updates

Updates

Issue by issue

Issue by issue

About this page

About this page

Scientific Issues in FAMOUS

Robin Smith

Scientific Issues in FAMOUS

Updates

Recent updates

Recent updates

Recent updates

Issue by issue

Issue by issue

About this page

About this page

Recent updates

Recent updates

Issue by issue

About this page

Robin Smith

Recent updates