海洋鑽探計劃─子計畫七：沖繩海槽西南端之熱流探測
Date Issued
2002
Date
2002
Author(s)
徐春田
DOI
902611M002022ODP
Abstract
During field-testing, we found the data
resolution of the marine heat probe developed by us
could reach the stunning 0.1m℃, which is much better
then the 1m℃ resolution indicated in the related
scientific literature. Today’s heat flow data are mostly
produced by Lister-type marine heat probe. The
advantage of this method is the capability of
measuring both temperature and thermal conductivity
of ocean floor sediments in situ. However, due to the
friction heat produced during the probe insertion
process, it is required to wait infinitely (often days)
until the temperature returning to its original
undisturbed state. Due to the much higher data
resolution produced by our new heat probe, we have
developed an improved data processing technique.
That is to utilize the short-term (12 minutes)
recordings of the temperatures raised by frictional heat
to predict the temperatures in the long term. The
principle is to regress the temperature decay function
of a heated cylindrical (Carslaw and Jaeger, 1959)
with respect to variables of the original undisturbed
temperature, temperature raised by frictional heat,
thermal conductivity, and product of density and
specific heat of the sediments. We found all the
variables are not quite accurate except the undisturbed
temperature of the sediments. But we are able to
accurately predict the long-term temperature changes
caused by frictional heat and the final undisturbed
temperature of the sediments. Through the numerical
and field test we have found that the undisturbed
temperature can be accurately calculated (±0.1m℃).
In order to incorporate the data processing method to
the high-resolution heat probe data, we therefore
established a heat flow data processing routine. We
applied the process on the data collected from
southwestern Okinawa Trough and compiled an
iso-heat flow chart, which also indicates the abnormal
high and low heat flow zones.
Subjects
High Resolution Heat Probe
Data Processing
Southwestern Okinawa Trough
Heat Flow
SDGs
Publisher
臺北市：國立臺灣大學海洋研究所
Type
report
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