Physical Changes in the Arctic Kim Holmn International Director - - PowerPoint PPT Presentation

▶

Feb 25, 2023 121 likes •349 views

Physical Changes in the Arctic Kim Holmn International Director Norwegian Polar Institute holmen@npolar.no Svalbard: Norwegian Arctic -13.1 Sv 11.5 Sv 1.6 Sv Kim Holmn. page 3 page 4 Kim Holmn. Climate Research Unit, University

SLIDE 1

Kim Holmén International Director Norwegian Polar Institute holmen@npolar.no

Physical Changes in the Arctic

SLIDE 2

Svalbard: Norwegian Arctic

SLIDE 3

Kim Holmén. page 3

13.1 Sv

11.5 Sv 1.6 Sv

SLIDE 4

Kim Holmén. page 4

SLIDE 5

Kim Holmén. page 5

Climate Research Unit, University of East Anglia

http://www.cru.uea.ac.uk/cru/info/warming/

SLIDE 6

Kim Holmén. page 6

http://data.giss.nasa.gov/gistemp/animations/

SLIDE 7

Kim Holmén. page 7

Geographical pattern of surface warming

Projected surface temperature changes for the late 21st century (2090-2099). The map shows the multi-AOGCM average projection for the A1B SRES scenario. All temperatures are relative to the period 1980-1999.

SLIDE 8

SLIDE 9

Summed mass balance ≈ volume change

Small glaciers BRG and MLB steadily retreating, accelerated 2001-2007
More negative balances after 2000 lead to net loss since 1986 for KNG
KRB-HDF surface mass balance similar to KNG
When calving and front retreat is added, KRB-HDF considerably more negative than all
ther glaciers

Jack Kohler, NPI

SLIDE 10

SLIDE 11

Kim Holmén. page 11

Sea surface temperature December 8, 2014

yr.no

SLIDE 12

What is changing in the Arctic Sea Ice System?

Arctic report card 2012/NSIDC Trend per decade: ‐13.7% NSIDC

Ice extent
Ice dynamics and distribution
Sea ice thickness
Univ. Bremen

See also Arctic Report Card 2013, NOAA

SLIDE 13

Maslanik & Tschudi, Arctic report card 2012

What is changing in the Arctic Sea Ice System?

Ice extent
Ice dynamics and distribution
Sea ice thickness

Tara (IPY, 2006‐08)

Photo: M. Nicolaus

Fram (1893‐96)

Photo: NPI archive

SLIDE 14

Ice thickness transpolar drift (EM)

What is changing in the Arctic Sea Ice System?

Ice extent
Ice dynamics and distribution
Sea ice thickness

Hopen max. seas. ice thickness ( drillings) Haas et al. 2008 GRL Gerland et al. 2008 GRL Hansen et al. 2013 JGR Fram Strait ice thickness (ULS)

SLIDE 15

http://www.climate.gov/news-features/videos/very-little-old-sea-ice-remains-arctic

SLIDE 16

SLIDE 17

Photo: Ann-Christine Engvall

SLIDE 18

Svalbard: Norwegian Arctic

Photo: Kit Kovacs and Christian Lydersen

Thanks for your attention ! Thanks for your attention ! Thanks for your attention !

WALRUS

SLIDE 19

Kim Holmén. page 19

IPCC, 2013

SLIDE 20

Kim Holmén. page 20

IPCC, 2013

SLIDE 21

SLIDE 22

Kim Holmén. page 22

IPCC, 2013