| Contact |
Dr.
Matt Nolan
Water and Environmental Research Center
Institute of Northern Engineering
University of Alaska, Fairbanks
matt.nolan@uaf.edu
|
|
http://www.uaf.edu/water/faculty/nolan/glaciers/McCall/index.htm
http://www.uaf.edu/water/staff/irving/presentation/re-conf-jan04/
|
| System |
 As of May 2005, there are four weather stations with
Campbell CR10X
dataloggers, requiring battery/solar systems for power, and eleven
stations equipped with Onset Computer Corp dataloggers that run on small,
non-rechargeable batteries (like AA or watch batteries) that must
be changed every year or two. This document describes the power
systems for the CR10X stations. |
| Location |
McCall Glacier is located in northeastern Alaska,
within the Romanzov
Mountains of the Brooks Range. These mountains are part of the Arctic
National Wildlife Refuge. This region of the Brooks Range swings far
to the North and is only 60 miles from the Arctic Coast. |
| Description |
The project maintains year-round autonomous weather
stations on and
around the glacier as part of an effort to document long-term change
in important glacier variables on the McCall. This effort is part of a
larger NSF grant looking at changes in the freshwater storage elements
that comprise the Arctic hydrological cycle. The stations are
designed to help understand the interactions between climate and
glacier dynamics. There are no other weather stations within ANWR,
which stretches for more than one hundred kilometers in all
directions.
The original equipment installed for Station JJMC included:
-
CR10X: S/NX19139 1MB -55C cal 7/28/99
-
AM16/32 multiplexor (for thermistors): S/N2792 new in 2003
-
AT/RH at nominal 1m (Vaisala HMP45): 1.26m (note: not recorded in May;
calculated based on SR50 and offsets)
-
AT/RH at nominal 3 m (Vaisala HMP45): 2.55m (note: not recorded in May;
calculated based on SR50 and offsets)
-
Net rad: REBS Q98282; Sensitivity parameters: Top: 9.32 Bottom: 11.40
-
Sonic ranger (SR50): 0.58 m
-
Met One 034B wind set:
-
13.5 m thermistor string with 25 thermistors
-
40 W solar panel/ 90 AH battery
|
| Data |
|
| Comms |
The glacier stations are linked by omni-directional
radio antennas to
station AHAB, which has a line-of-sight radio telemetry link to a
computer connected to the internet in Kaktovik, which proceeds by
satellite link to somewhere to eventually reach fiber. In general we
have had few problems with this telemetry system. In fact, nearly all
of them were caused by factors well outside of our control. For
example, a storm knocked out power for the village of Kaktovik for
about a week; when it was restored, the telemetry came back on-line.
Similarly, UAF networking made major changes to the network without
telling us, and it took some time to reconfigure things. All of the
radios are wired into a switched 12V port, such that we turn them off
via the program except when we are using them, which is typically once
per hour. The program is designed such that if power drops below 12V
(or whatever we decide), telemetry is restricted to once per day,
typically noon. |
