Transcript Deep Argo Pilot in Indian Ocean

Deployments of Deep Argo pilot arrays
Indian Ocean and Southern Ocean
JAMSTEC
Toshio Suga & JAMSTEC collegues
Research and Development Center for Global Change,
Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
US Argo/NZ Argo
Input from Dean Roemmich and Nathalie Zilberman
Observation status
2 DeepNINJAs start monitoring for deep Indian Ocean.
Latest status (update monthly) : http://www.jamstec.go.jp/ARGO/deepninja/
Deep NINJA: The first practical float
measurable in the deeper ocean than 2000m
210 cm
Specification of Deep NINJA
 Max. profile depth: 4000 dbar
 Available from the tropics to the high-latitudes with
seasonal ice
 About 90% of the ocean’s volume is measurable
 Pressure hull: Aluminum alloy
25 cm
 Sensor: SBE 41CP
 Enough capacity for additional sensors
 Communication: Iridium SBD, two-way
 Position fixing: GPS
 Est. lifetime: (more than) 1 year (by Lithium battery)
 Functions:
50 kg
Avoidance of surface sea ice
Avoidance of groundings
Scientific Target
 Identify the
seasonality of
deep ocean for
Indian basin
=>helpful to detect
climate signals,
for instance,
when using
repeat
hydrography data.
=>effective
constraint for
deep ocean state
 Examine the
ability to detect
the long-term
(inter annual
to pentadal)
climate signal
=>Indian Ocean
shows bottomwater cooling,
which is
different from
other major
basins except
of North
4000-5000m water temp change
5000m-bottom water temp change
Indian Ocean Pilot Array
フロートを分解することなく、
センサー部に海水を通して
実施する簡易検定機器
We deployed 2 Deep NINJAs around end
of January. Now, they have provided four
profiles until now.
They are in operation with the previouly
deployed SO Deep NINJAs.
水温
投入風景
水温
塩分
塩分
Recent profiles of T/S
2016 plan
 Hopefully, one more deep NINJA for Indian array…At
present, we can not find a suitable cruise for a
deployment.
[Southern Ocean]
 2 deep NINJAs for the CSIRO inter-comparison Project.
[North Pacific]
 1 Do- deep-apex for an impact experiment by using a
JAMSTEC state estimation system ESTOC.
US Argo/NZ Argo: R/V Kaharoa,
Deep Argo 2016-17
 R/V Kaharoa cruise in October-December 2016
Red circles: Deep Argo floats