Notes from 26/27 May 2004 Science Sub-group meeting

Present:

TFRI:

Hen-Biau King <hbking@serv.tfri.gov.tw>

Alan Lai <d87625005@ntu.edu.tw>

UW Trout Lake:

Tim Kratz <tkkratz@wisc.edu>

Tim Meinke twmeinke@wisc.edu

Matt Van de Bogert <vandebogertm@ecostudies.org>

UW- Madison:

Paul Hanson <pchanson@wisc.edu>

Barbara Benson <bjbenson@wisc.edu>

UCSD/SDSC

Longjiang Ding <ljding@sdsc.edu>

Next Meeting Full Group(Tentative Date/Time):

2/3 April 2004

3 April 2004, 8 am Taiwan

2 April 2004, 5 pm San Diego, 7 pm Wisconsin , 8 pm DC

Action Items:

- Matt: draft schedule of science activities during his stay (visits to YYL, sampling schedule, equipment needs, etc.). Send schedule to group

- Tim: draft a few slides about project that Hen-Biau can use during ILTER meeting in Manaus

- Paul: literature search on reasonable rates of photo-oxidation of DOC in lakes

- Alan/Julian: visit YYL next week to replace Quantum sensor, hook up water level sensor and barometer to wireless network, replace storage module on buoy datalogger, and replace the UW Templine.

- Alan/Tim Meinke: email about best way to calibrate templine sensors

- Hen-Biau: consult with climate specialist regarding adequacy of precipitation device to handling typhoon

Agenda Items for Next full group meeting:

- Review action items from last time:

o Matt science/logisitc plan (Matt)

o Equipment installation at YYL (Charles)

o Latest on analysis of YYL buoy data (Paul)

- Report from Peter and Fang-Pang on relevant parts of PRAGMA meeting, etc. (Peter/Fang-Pang)

- Update on Australian/NZ project

- Schedule next vtc.

Summary:

1. Metabolism estimates from YYL (Paul)
1. Data report

Paul reported on an interesting pattern of increasing O2 concentration at night and decreasing during the day. Current hypotheses to explain this unexpected pattern include: 1) O2 sensor malfunction (this is unlikely, we cannot completely rule it out at this point), 2) photo-oxidation of DOC during day, 3) movement of higher O2 concentration from deeper in water column to the sensor at night. Plan is for Matt to bring several more O2 sensors and place them in strategic places in the water column to test the first and third hypothesis. Paul will look for literature values for photo-oxidation for lakes at this altitude.

2. Do we need to be measuring barometric pressure on the raft or weather station?

Paul reports that sensitivity analysis shows that metabolism estimates are not overly sensitive to errors in estimating barometric pressure. Alan reports that he plans to install barometer as part of the water level sensing equipment, so we will have continuous measurements of barometric pressure

2. New sensors at YYL (Alan?)
1. Water level on line

Alan and Julian will visit YYL week of 31 May to install radio so water level data can be transmitted back to NCHC. Hsui-Mei and Longjiang will need to modify system to allow data to be reported on web page

2. Li-Cor Quantum sensor

Alan plans to swap out old quantum sensor with a new one

3. Better precip sensor

Hen-Biau will ask weather specialist about the equipment necessary to measure precipitation during a typhoon.

4. Templine status

Alan will replace the UW templine with the original one. Tim will plan to bring the UW templine back to Wisconsin when he visits in July. Alan and Tim Meinke will email about best way to calibrate templine.

3. Matt’s trip: science and logistics (Tim and Matt)

Matt and Tim K. will arrive in Taipei evening of 5 July. Tim leaves 11 July, Matt stays until mid August. Matt will prepare documenting schedule of visits to YYL and the samples he will plan to take. Will list equipment he will plan to bring and what he will need when he arrives. Matt’s project will include routine sampling for various standard physical, chemical, biological variables as well as detailed sampling of spatial/temporal variation of O2 using 3-6 sondes he will bring with him.