tt.pre {flux}

One day data from closed chamber measurements in the Trebeltal

Description

The data comes from the Trebeltal / Northeastern Germany and has been recorded with flexible non-steady state closed chambers in March 2011. It contains concentration data from 18 chamber measurements including calibration gas measurements that have been carried out alternatingly on the GC.

Usage

data(tt.pre)

Format

A data frame with 118 observations on the following 17 variables.

year

numeric vector giving the year of measurement

date

factor giving the date of field sampling, format is "%Y-%m-%d"

time

factor giving the time of measurement in the field, format is "%H:%M"

veg

factor with levels c p t

spot

numeric vector, but it is a factor giving the number of the field measurement location. The combination of veg and spot uniquely identifies the measurement locations in the site

time_min

numeric vector, time in minutes during the chamber placement. starts with 0 from placing the chamber

sampletype_a

factor with levels E P determining whether its a field concentration measurement or a calibration gas measurement

temp_dC

numeric vector, air temperature within chamber during measurements, taken at the same times as the concentration samples

cham_vol

numeric vector, chamber volume per chamber placement. Varies from chamber placement to chamber placement depending on the chamber used

cham_area

numeric vector giving the chamber area

date_gc

factor giving the date of the gc measurement, format is "%Y-%m-%d"

CO2Code

numeric vector, quality parameter from the GC

CO2ppm

numeric vector, concentration of CH4 in air sample / calibration gas sample

N2OCode

numeric vector, quality parameter from the GC

N2Oppb

numeric vector, concentration of N2O in air sample / calibration gas sample

CH4Code

numeric vector, quality parameter from the GC

CH4ppb

numeric vector, concentration of CO2 in air sample / calibration gas sample

Details

The 18 chamber measurements are carried out on three vegetation types (Phragmites, Typha, Carex).

Source

unpublished preliminary data, whole data set in

Günther A, Huth V, Jurasinski G, Glatzel S (2013a) Scale-dependent temporal variation during the determination of the methane balance of a temperate fen. Greenhouse Gas Measurement & Management DOI: 10.1080/20430779.2013.850395

Huth V, Günther A, Jurasinski G, Glatzel S (2013) The impact of an extraordinarily wet summer on methane emissions from a 15-year re-wetted fen in north-east Germany. Mires & Peat 13.2:1–7

Examples

## load data
data(tt.pre)
## see their structure
str(tt.pre)