methane carbon dioxide

dissolved organic C

NECB= net land-atmosphere C(CO2,CH4) fluxes - lateral C flux

Han Dolman, Ko van Huissteden, Joshua Dean, Trofim Maximov, Roman Petrov, Luca Belelli Marchesini

NECB=-NEE+FCO+FCH4+FVOC+FDIC+FDOC+FPC

NECB = dC/dt

NEE= net CO2 ecosystem-atmosphere flux

FCO= net carbon monoxide (CO) flux

FCH4= net methane (CH4) flux

FVOC= net volatile organic C (VOC) flux

FDIC= net dissolved inorganic C (DIC) input/ouput

FDOC= net dissolved organic C (DOC) input/ouput

FPC=net lateral transfer of particulate C (non-dissolved, nongaseous) C

via soot emission (fires), water and wind deposition/erosion.

(mod. after Chapin III et al, 2006)

Eddy covariance technique Mass flow

Methods – Net Ecosystem Carbon Balance – theoretical framework

120 180 240 300

CO

2 fl

ux

(dai

ly m

ean

) [1

0-6

mol

CO

2 m

-2s-

1 ]

-4

-3

-2

-1

0

1

2

3

120 180 240 300 120 180 240 300

2014 2015 2016

Net Ecosystem Excange

Rai

n [m

m]

0

2

4

6

8

10

12

14

Wat

er d

isch

arge

[m3 d

-1]

0

100

200

300

400

500

600

700rainwater discharge WD int.

doy

160 170 180 190 200 210 220 230 240 250

Dis

solv

ed c

arbo

n [%

]

0.00

0.02

0.04

0.06

0.08

0.10

0.12

C e

xpor

t [k

g d-1

]

0

20

40

60

80

100

120

140

160

180

200diss. CC exportC export int.

AL d

epth

[cm

]

25303540

Water discharge measurementsTotal DOC export over 89 days: 3108.9 Kg

Cumulative FDOC= 3.12 gC m-2

Lateral C fluxes (FDOC)

Catchment area assessment: 995132 m2 ~ 1Km2

Uncertainty: ±20%

EC methane fluxes, carbon and GHG budget

Carbon quantity emitted/exported as CH4/DOC similar and small fraction of NECB (0.3%)

Kytalyk tundra consistent carbon sink during the snow free season with moderate inter-annual variability(CV:0.2 and 0.35 for NECB and GHG budget)