GLEON update

Finland, March 2007

N

Rotorua Lakes District

Diel oxygen data: Lake Rotorua

• ~ 4 months of surface DO measurement every 15 min.

• General trend of decreasing DO with increasing temperature.

• Strong variation at scales < 1 day.

8

9

10

11

12

13

20-Sep 04-Oct 18-Oct 01-Nov 15-Nov 29-Nov 13-Dec 27-Dec 10-Jan

Dis

solv

ed o

xyge

n [m

g L -

1 ]

11

12

13

14

15

16

17

18

19

20

21

Tem

pera

ture

[ oC

]

DO

Temperature

Diel oxygen data: Lake Rotorua

Example:

Example: 3 weeks, 30 Oct to 20 Nov 2006.

9

10

11

12

30-Oct 06-Nov 13-Nov 20-Nov

Dis

solv

ed o

xyge

n [m

g L -

1 ]

13

14

15

16

17

18

Tem

pera

ture

[ oC

]

DO

Temperature

L. Rotorua

L. Rotoiti:Narrows

L. Tarawera

L. Rotoiti:Crater

Tarawera:Weather station

Projected remote monitoring sites

Currently live:Tarawera weather station

Prototype lake buoy:Lake Rotorua (Mar/Apr 2007)

Sites to come: Lake Rotoiti: crater and narrowsLake Tarawera

Monitoring buoy

Delivered Dec 2006; the fitting of the electronics is (almost) complete, and deployment is being arranged with local authorities.

DO

Th

erm

istor strin

g (1

1 se

nso

rs, on

e e

very

2 m

ete

rs)

~ 20m

redox/nitrate/temp

pH/chloride/temp

• Datalogger – iQuest “DS-4483” logger

Initial deployment:

• Thermistor string - Apprise Technologies “TempLine”

• Dissolved oxygen - Zebra-tech “d-opto” optical sensors

• Fluorometer – Seapoint chlorophyll fluorometer

Sensors to be added later:

• pH and chloride – INW “TempHion T3” sensors

• Irradiance – Appogee QSO quantum sensors

Buoy station sensors

DO

chl a

pH/chloride/temp

~1 m

Light meters

• NZ company “iQuest” remote monitoring network “Hydrotel”

https://data.iquest.co.nz/hydrotel

Telemetry/databasing

Login: guestPasswd: guest

This login allows access to 2 weather stations, as a demo of the hydrotelinerface