ON THE 2ND INTERNATIONAL WORKSHOP ON AIRBORNE GRAVIMETRY AND POLAR
Svalbard, Norway, August 7, 1999.
participants from six countries gathered to an informal workshop on
the Arctic gravity field, held at UNIS (University of Svalbard),
Longyearbyen, Norway. The workshop was called at short notice to take
advantage of several airborne gravity survey activities taking place
at the same time from this high-Arctic location. The meeting was
called to follow up a similar workshop held in Kangerlussuaq,
Greenland, June 2-4, 1998. The workshop was sponsored by IAG section
workshop was organized by KMS (National Survey and Cadastre, Denmark)
and University of Bergen. R. Forsberg, KMS initiated the workshop with
a presentation on the Arctic Gravity Project, an international effort
to compile a gravity grid of the Arctic region, a.o. to support the
planned gravity field satellite missions. The Arctic Ocean is
currently the object of intense gravity survey activities from both
aircraft, submarines and icebreakers, and additionally the relaxation
of historical tensions in the region have meant that comprehensive
Russian data are now being presented also to western researchers.
Sergei Maschenkov (VNIIO, Russia) gave an overview of results of the
intensive Russian program by the presentation Arctic Gravity and
Magnetic Compilation, in part carried out within a US/Russian
bilateral coopeation. Most of the Arctic is covered with gravity
observations, with many surveys carried out from numerous ice camps of
the former Soviet Union. John Brozena (Naval Research Lab., USA) gave
an overview talk of current US airborne activities in the Arctic.
Since 1992 major parts of the western and central Arctic basins have
been covered by long-range airborne gravimetry, in a program sponsored
by NIMA. The data have provided significant new insight into the major
tectonic elements of the Arctic Ocean. More technical talks included
presentations by V. Childers (NRL) and A. V.Olesen (KMS) on details of
aerogravity measurements and processing, and by K. Keller (KMS) and B.
Nelson (DRE, Canada) on hardware setup for aerogravity and magnetic
measurement systems. The later paper illustrated the high accuracy of
modern magnetometer systems (.05 nT), as well as gave the point that
magnetic measurements should referably always be made alongside
aerogravity in such operationally difficult areas like the Arctic.
project talks included presentation on German icebreaker and
aerogeophysical activities in the Fram Strait region by U. Meyer (AWI,
Germany), on ongoing KMS survey activities around Greenland (A. Olesen),
Norwegian aerogravity activities in Greenland (D. Solheim/SK, A.
Gidskehaug/UiB), and on Russian aerogravity activities around Frans
Josef Land carried out in recent years. The different projects, based
on many different kinds of aircraft (smaller Twin-Otters or Do-228s,
or long-range P-3s or IL-38s) shows that aerogravity has now become an
operational tool, although there still is room for much research and
development on both improving gravity sensor performance as well as
improving accuracy of long-range kinematic GPS.