Chamber calibration campaign: Comparison of static chambers to measure N2O,
CH4 and CO2 fluxes from soils
Duration: 17/8/2008 - 3/10/2008
Location: Hyytiälä forestry field
station
http://www.mm.helsinki.fi/hyytiala/english/eng_index.htm
Organizing team: Mari Pihlatie1,
Jesper Riis Christiansen2, Jukka Pumpanen3
1Department of Physics, Division of Atmospheric Sciences and Geophysics,
2Department of Forest & Landscape Ecology,
3Department of Forest Ecology,
New 1: The campaign is fully booked except for the week 35 (place for one
small chamber).
New 2: Workshop on
Comparison of static chambers to measure N2O, CH4 and CO2
fluxes from soils in
Background
In many environmental studies the soil fluxes of the
greenhouse gasses (GHG) nitrous oxide (N2O), methane (CH4)
and carbon dioxide (CO2) are measured by closed static chambers. Due
to large spatial and temporal variability of GHG production and consumption in
soils, a large number of replicate chambers are often required. Static chambers
can be constructed using inexpensive materials, enabling the researcher to
install a large number of replicate chambers. Dependent on the chamber design the
magnitude of impact in the surroundings vary, and is difficult to assess in
quantitative terms.
To obtain information on the differences between
static chambers we will organize a chamber calibration campaign. The purpose of
the campaign is to test different types of static chambers for N2O,
CH4 and CO2 fluxes under controlled conditions using a
constant flux calibration tank. The overall aims of the campaign are to
quantitatively assess the uncertainties and errors related to static chamber
measurements, and to bring together and discuss these problems with researchers
working in the field of GHG fluxes from different ecosystems.
The overall aim of the measurement campaign is to improve measurement quality in gas fluxes of N2O, CH4 and CO2 from soils, to provide guidelines for chamber designs and sampling procedures, and to share knowledge on chamber measurement techniques between flux measurement communities. For the comparison, ten chambers with different dimensions, material and sampling protocol will be selected and tested.
The
results from the calibration campaign can be used in the ongoing research
projects NitroEurope, ESF-NinE, Carboeurope, Fluxnet, IMECC and Scandinavian network of flux
towers (e.g. NECC). As
the chamber calibration aims at providing error estimates for static chambers,
this campaign gives tools to compare flux estimates across
In
November 2008 we will organize a workshop in
PRACTICAL INFORMATION
The
calibration campaign will last for 5-8 weeks depending on the number of
participants. It will be organized in small groups where a maximum of 3
chambers will be calibrated at a time during 6-day periods between Monday and
Saturday. The chambers will be calibrated with soils of 2 different porosities
and this is why each calibration session will take approximately 5-6 days. We
will start each session on Monday noon and try to finish it by Friday evening.
If possible try to arrange your flight tickets so that you will arrive at Hyytiälä
on Sunday evening or Monday morning and leave on Saturday.
The
N2O, CH4 and CO2 emissions measured by
individual chambers will be compared to known gas fluxes generated by a
calibration chamber described by Pumpanen
et al. (2004). During the calibration, the chamber being tested
will be placed on a layer of quartz sand (150 mm thick) on top of the
calibration chamber. The sand layer is 990 mm in diameter and your chamber has
to fit within this diameter. The maximum size of a rectangular chamber, which
fits into this space is about 650 mm x 650 mm. Longer and narrower chambers up
to 200 mm x 900 mm can also be calibrated. Remember to tell the size of your
chamber when making the reservation (chamber
questionnaire). If you use collars with your chamber, please
take 3 collars with you.
REGISTRATION
Please,
fill in the registration
form and send it to Mari
Pihlatie. Also, choose the group and dates when you want to calibrate your
chamber from the calendar.
In the calendar
the available dates and groups are marked by green and occupied dates by red
color. Note that due to a cancellation there is place for one participant
during the week 35 (small chamber only). The number of available places in a
group is marked in parenthesis. The reservation situation is updated daily.
Participants who have registered and who have been accepted so far will be
listed here. In case of overwhelming interest in the calibration, we may need
to choose the participants. In that case we will do our best to select as many
different types of chambers as possible.
When
you have been accepted to participate in the campaign, please, inform the
number of persons, the time and place of arrival and the departure by email to:
Mari Pihlatie.
DEADLINE FOR REGISTRATION IS JUNE 20, 2008.
With
the help of funding from ESF-NinE and ACCENT we
are able to pay part of your travelling and accommodation costs. We particularly
support the participation of PhD and MSc students with a travel grant of
maximum of 500 EUR, and accommodation up to 40 EUR / day at Hyytiälä forestry
field station.
In
addition, there will be a participation fee of 200 EUR for registration before
1. June 2008 and 250 EUR after June 1. 2008. This fee is directed to cover meals
(breakfast, lunch, and dinner) at Hyytiälä, practical costs of the campaign and
transport from
HOW TO GET TO HYYTIÄLÄ?
Please,
book and send your traveling details to the organizing
group Mari Pihlatie, Janne Korhonen and Jesper Riis Christiansen. Janne
is the contact person at Hyytiälä and helps with practical arrangement related
to traveling, arrival, pick-up from the airport or train station. Contact him
if you want help during July as Mari Pihlatie is on a holiday during 4-28 July.
By plane:
The
easiest way to get to Hyytiälä is to fly to
By train:
You
can take a train from
By bus:
There
is a direct bus connection between
By car and ferry:
You
can take your car to the ferries between
If you need to stay an extra day
or two in
We
recommend the Hotel Arthur close
to the central railway station. There you will get a small discount by
mentioning that you are a guest of the
or in
Information
on
http://www.tampere.fi/english/tourism/index.html
WHERE TO SHIP YOUR CHAMBER
If
you like to ship your chamber to Hyytiälä prior to the campaign, you can send
it to the address:
Your
name
Chamber
calibration campaign
Hyytiälä
forestry field station
Hyytiäläntie
124
FI-35500
Korkeakoski