Estimating the thickness of ridged sea ice from ship observations in the Ross Sea

T Tin*, MO Jeffries, M Lensu, J Tuhkuri

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

4 Sitaatiot (Scopus)

Abstrakti

Ship-based observations of sea ice thickness using the Antarctic Sea Ice Processes and Climate (ASPeCt) protocol provide information on ice thickness distribution at relatively low cost. This protocol uses a simple formula to calculate the mass of ice in ridges based on surface observations. We present two new formulae and compare these with results from the "Original" formula using data obtained in the Ross Sea in autumn and winter, The new "r-star" formula uses a more realistic ratio of sail and keel areas to transform dimensions of sails to estimates of mean keel areas. As a result, estimates of "equivalent thickness" (i.e. mean thickness of ice in ridged areas) increased by over 200%. The new "Probability" formula goes one step further, by incorporating the probability that a sail is associated with a keel underwater, and the probability that keels may be found under level surfaces. This resulted in estimates of equivalent thickness comparable with the Original formula. Estimates of equivalent thickness at one or two degree latitude resolution are sufficiently accurate for validating sea ice models. Although ridges are small features in the Ross Sea, we have shown that they constitute a significant fraction of the total ice mass.

AlkuperäiskieliEnglanti
Sivut47-54
Sivumäärä8
JulkaisuAntarctic Science
Vuosikerta15
Numero1
DOI - pysyväislinkit
TilaJulkaistu - tammikuuta 2003
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu
TapahtumaInternational Conference on the Oceanography of the Ross Sea - Antarctica - Ischia, Italia
Kesto: 8 lokakuuta 200113 lokakuuta 2001
Konferenssinumero: 2

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