30

40M

axim

um S

WE

, cm

Sleepers River SWE

0

10

20

1965

1970

1975

1980

1985

1990

1995

2000

2005

Max

imum

SW

E, c

m

1960

Total biomass estimates for Sleepers River and Hubbard Brookand Cone Pond

Mg/ha

200

220

240

260

280

300

TransectsHubbard BrookThornes HectareCone PondW-1Valley

Sleepers River-transectsand Thornes hectare

Cone Pond

W1

Valley plots

Year1965 1970 1975 1980 1985 1990 1995 2000 2005

140

160

180

200

Hubbard Brook

Cone Pond

biomass.jnb on c:sleepers river

Sleepers Hillslope

RiparianGW

HilslopeGW

Stream

HillslopeHollow

4

5

6

7

1

10

100

Sleepers R. W-9 rewetting event, 9/15/02

Methyl HgTotal Hg

Dis

char

ge (

cfs)

Hg concentration, ng/L

Sleepers River Summer Storm

0

1

2

3

0.01

0.1

1

6 7 8 9 10 11 12 13

Dis

char

ge (

cfs)

Hg concentration, ng/L

Sep 15 hours

DOC (mg C L-1)

0 2 4 6 8 10 12 14 16

Disso

lved

THg (ng L-1)

0

2

4

6 HBEF r2 = 0.67 Sleepers River r2 = 0.79 Beaver Meadow r2 = 0.86 Lake Inlet r2 = 0.92

Disso

lved

THg (ng L-1)

4

6HBEF r2 = 0.74Sleepers River r2 = 0.88 Beaver Meadow r2 = 0.89Lake Inlet r2 = 0.92

Total Hg:vs. DOC

vs. HPOAvs. UV abs.

DOC (mg C L )

HPOA (mg C L-1)

0 2 4 6 8 10

Disso

lved

THg (ng L

0

2

UV absorbance (254 nm)

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7

Disso

lved

THg (ng L

-1)

0

2

4

6HBEF r2 = 0.80Sleepers River r2 = 0.89Beaver Meadow r2 = 0.92 Lake Inlet r2 = 0.94

Progressive r2 increaseDittman et al. (2009, 2010)

Logging Fluorometers

Fluorescence

Installation at Hubbard Brook

Fluorescence

40

80

120

cDO

M, p

pb

Sleepers RiverFall Storms

FDOM

0.01

0.1

1

10

1 11 21 31 10

Q, m

m h

r-1

October November

40

cDO

M, p

pb

Flow

Sleepers River Water Year 2009DOC computed

from FDOM0

2

4

6

8

10

0 20 40 60 80

DO

C, m

g/L

FDOM (ppb QSE)

3- (µµ µµM)

10

15

20

25

3

4

5

6

In situ NO3-

Discrete NO3-

Discharge

a)

DOC and nitrate from in situ sensorsSleepers River snowmelt 2009

NO

0

5

10

Disch

arge (C

FS)

0

1

2

3/23/09 3/30/09 4/6/09 4/13/09 4/20/09 4/27/09 5/4/09 5/11/09

DOC (m

g/L)

0

1

2

3

4

5

6

0

1

2

3

4

5

6In situ DOCDiscrete DOCDischarge

b)

4

5

6

Filt

ered

TH

g, n

g L-1

HPOA

r2=0.978

Sleepers River - Filtered Hg vs. DOC and HPOA

0

1

2

3

0 5 10 15 20

Filt

ered

TH

g, n

g L

DOC or HPOA, mg L-1

DOC

r2=0.935

0.030

0.035

0.040

-1 m

g C

-1

Aromatic

SUVA during Sleepers River Snowmelt

HBEF W6

LabileHigh Flow

(more HPOA)

0.010

0.015

0.020

0.025

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

SU

VA

, L c

m-1

Specific discharge, mm hr-1

Aliphatic

0 200 400 600 800 1000 1200

Stream

Bs

Bh

Oa

DOC flux mmol m-2 yr-1

Organic matter degrades

Recalcitrant

Low Flow

FDOM Hysteresis Loops

Fall storm

Latespring

Snowmelt

Summerstorm