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Titel |
High Frequency Fluctuations in the Heat Content of an Ocean General Circulation Model |
VerfasserIn |
Adriana Huerta-Casas, David Webb |
Konferenz |
EGU General Assembly 2013
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Medientyp |
Artikel
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Sprache |
Englisch
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 15 (2013) |
Datensatznummer |
250074187
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Zusammenfassung |
The transport and storage of heat by the ocean is of crucial importance because of its effect
on ocean dynamics and its impact on the atmosphere, climate and climate change.
Unfortunately, limits to the amount of data that can be collected and stored means that many
experimental and modelling studies of the heat budget have to make use of mean datasets
where the effects of short term fluctuations are lost.
In this paper we investigate the magnitude of the resulting errors making use of data from
OCCAM, a high resolution global ocean model. The model carries out a proper heat balance
every timestep so any imbalances that are found in the analysis must result from the use of
mean fields.
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The study concentrates on two areas of the ocean affecting the El Nino. The first is the region
of tropical instability waves north of the equator. The second is in the upwelling region along
the equator.
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It is shown that in both cases, processes with a period of less than five days can have a
significant impact on the heat budget. Thus analyses using data averaged over five days or
more are likely to have significant errors. It is also shown that if a series of instantaneous
values is available, reasonable estimates can be made of the size of the errors. In model
studies such values are available in the form of the datasets used to restart the model. In
experimental studies they may be in the form of individual unaveraged observations. |
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