☆Geophysical Research Letters☆
1.
Offshore
permafrost decay and massive seabed methane escape in water depths >20 m at the South Kara Sea shelf
Alexey Portnov, Andrew J. Smith, Jürgen
Mienert, Georgy Cherkashov, Pavel Rekant, Peter Semenov, Pavel Serov and Boris
Vanshtein
DOI: 10.1002/grl.50735
Key Points
l
Seafloor gas expulsion is widespread at the South
Kara Sea shelf
l Gas expulsion is
limited approximately to water depths >20 m
l
A sub-seabed permafrost cap may prevent gas
migration in water depths < 20 m
2.
Ti
content in Huguangyan maar lake sediment as a proxy for monsoon induced
vegetation density in the Holocene
Ji Shen, Xudong
Wu, Zhaohui Zhang, Weiming Gong, Tong He, Xiaomei Xu and Hailiang Dong
DOI:
10.1002/grl.50740
Key Points
l
Ti in HGY sediment are predominantly from wall rock
erosion
l
monsoon induced vegetation density controlls Ti
input to HGY
l
Decreased vegetation density, increased Ti input
through the Holocene
3.
Physical
constraints for temperature biases in climate model
O. Bellprat, S.
Kotlarski, D. Lüthi and C. Schär
DOI:
10.1002/grl.50737
Key Points
l
Stationarity of summer temperature bias in climate
models is analyzed
l
Recently proposed linear correction of biases levels
off at high temperatures
l
Limits of soil moisture depletion lead to a
transition to constant biases
4.
Absent
growth rings are rare in Northern Hemisphere forests outside the American
Southwest
Scott St. George,
Toby R. Ault and Max C.A. Torbenson
DOI:
10.1002/grl.50743
Key Points
l
Absent rings can cause errors in tree-ring dates and
climate reconstructions
l
Absent rings are rare in trees at high latitudes and
high elevations
l
Mismatches between simulations and proxies are not
likely due to dating errors
5.
Impact
thermochronology and the age of Haughton impact structure, Canada
Kelsey E. Young,
Matthijs C. van Soest, Kip V. Hodges, E. Bruce Watson, Byron A. Adams and
Pascal Lee
DOI:
10.1002/grl.50745
Key Points
l
Impact yields thermal pulses capable of resetting
isotopic chronometers
l
(U-Th)/He thermochronology is a viable technique for
dating impact events
l
(U-Th)/He dates reveal an early Miocene age for the
Haughton impact structure
6.
Mass-induced
sea level change in the northwestern North Pacific and its contribution to total
sea level change
Xuhua Cheng,
Lijuan Li, Yan Du, Jing Wang and Rui-Xin Huang
DOI:
10.1002/grl.50748
Key Points
l
Remarkable variability in MSSH is found in the
northwestern North Pacific
l
For the period 2003-2011, MSSH has significant
contribution to the SSH rise
l
Trends in MSSH and surface wind are related to the
Pacific Decadal Oscillation
7.
On
the additivity of radiative forcing between land-use change and greenhouse
gases
Andrew D. Jones,
William D. Collins and Margaret S. Torn
DOI:
10.1002/grl.50754
Key Points
l
We simulate combined climate effects of land-use
change and greenhouse gases
l
Forcing from different agents is not additive but
their climate responses may be
l
The climate effects of land-use change are driven by
fast responses
8.
Correction
to “Revisiting the Earth's sea-level and energy budgets from 1961 to 2008”
John A. Church,
Neil J. White, Leonard F. Konikow, Catia M. Domingues, J. Graham Cogley, Eric
Rignot, Jonathan M. Gregory, Michiel R. van den Broeke, Andrew J. Monaghan and
Isabella Velicogna
DOI:
10.1002/grl.50752
9.
Systematic
ENSO-driven nutrient variability recorded by central equatorial Pacific corals
Michèle LaVigne,
Intan S. Nurhati, Kim M. Cobb, Helen V. McGregor, Daniel Sinclair and Robert M.
Sherrell
DOI:
10.1002/grl.50765
Key Points
l
Equatorial Pacific corals show 35-45% nutrient
decrease during three El Ninos
l
P/Ca coral proxy extends and improves records of
direct nutrient measurements
l
Phytoplankton drawdown caused nutrient levels to lag
SST recovery post-ENSO
10.
Winter
motion mediates dynamic response of the Greenland Ice Sheet to warmer summers
Andrew Sole, Peter
Nienow, Ian Bartholomew, Douglas Mair, Thomas Cowton, Andrew Tedstone and Matt
A. King
DOI:
10.1002/grl.50764
Key Points
l
Increased surface melting leads to faster ice flow
in summer
l
But increased melting also leads to slower ice flow
in the subsequent winter
l
The net effect of melting on interannual ice flow
variation is therefore limited
11.
Shifting
seasonality and increasing frequency of precipitation in wet and dry seasons
across the U.S.
Indrani Pal, Bruce
T. Anderson, Guido D. Salvucci and Daniel J. Gianotti
DOI:
10.1002/grl.50760
Key Points
l
Regionally consistent trends of wet/dry seasons
timing were evident
l
Prominent increases (decreases) in dry spell occured
l
Atlantic Plains experienced decrease in frequency
and an increase in dry spell
☆Journal of Geophysical Research:
Oceans☆
12.
Ocean
bottom pressure seasonal cycles and decadal trends from GRACE release-05: Ocean
circulation implications
Gregory C. Johnson and Don P. Chambers
DOI: 10.1002/jgrc.20307
Key Points
l Regional and global ocean mass seasonal
cycles and trends are analyzed.
l The N. Pacific, S. Atlantic and S. Indian
gain mass relative to a net increase.
l Mass changes spin up gyres in the Pacific,
S. Indian, and S. Atlantic in winter.
13.
Low
frequency variability on the continental slope of the southern Weddell Sea
Mari F. Jensen, Ilker Fer and Elin Darelius
DOI: 10.1002/jgrc.20309
Key Points
l Weddell Sea continental slope is home to
energetic oscillations at 35 h period.
l The variability is identified as mode 1
barotropic coastal trapped waves.
l Possible generation site is the Filchner
Depression and the nearby ridges.
14.
A
nonstationary analysis for the Northern Adriatic extreme sea levels
Marinella Masina and Alberto Lamberti
DOI: 10.1002/jgrc.20313
Key Points
Slight time increase is found in Venice and
Porto Corsini extreme sea levels
Coast exposure governs extreme sea level
seasonal patterns in Northern Adriatic
Significant correlation exists between
Northern Adriatic extremes and NAO and AO
☆Journal of Geophysical Research:
Atmospheres☆
15.
Climate
model response from the Geoengineering Model Intercomparison Project (GeoMIP)
Ben Kravitz, Ken Caldeira, Olivier Boucher,
Alan Robock, Philip J. Rasch, Kari Alterskjær, Diana Bou Karam, Jason N. S.
Cole, Charles L. Curry, James M. Haywood, Peter J. Irvine, Duoying Ji, Andy
Jones, Jón Egill Kristjánsson, Daniel J. Lunt, John C. Moore, Ulrike Niemeier,
Hauke Schmidt, Michael Schulz, Balwinder Singh, Simone Tilmes, Shingo Watanabe,
Shuting Yang and Jin-Ho Yoon
DOI: 10.1002/jgrd.50646
Key Points
l Temperature reduction from uniform
geoengineering is not uniform
l Geoengineering cannot offset both
temperature and hydrology changes
l NPP increases mostly due to CO2
fertilization
16.
Thermal
characteristics of the cold-point tropopause region in CMIP5 models
Joowan Kim, Kevin M. Grise and Seok-Woo Son
DOI: 10.1002/jgrd.50649
Key Points
l Thermal characteristics of the cold-point
tropopause in CMIP5 models
l Climatology, seasonal cycle, intraseasonal
and interannual variabilities at CPT
l Future trend in the CPT temperature in CMIP5
(RCP8.5 runs)
☆Global Biogeochemical Cycles☆
17.
A
joint atmosphere-ocean inversion for the estimation of seasonal carbon sources
and sinks
K. Steinkamp and N. Gruber
DOI: 10.1002/gbc.20064
Key Points
l Each data constraint has a significant
influence on the inverse flux estimates.
l Conclusions drawn from different constraints
disagree in some regions.
l The Amazonian biosphere is estimated to
release 0.6 PgC each year.
☆Climate of the Past☆
18.
Preliminary
estimation of Lake El'gygytgyn water balance and sediment income
G. Fedorov,
M. Nolan, J. Brigham-Grette, D. Bolshiyanov, G. Schwamborn,
and O. Juschus
DOI:10.5194/cp-9-1455-2013
19.
Detailed
insight into Arctic climatic variability during MIS 11c at Lake El'gygytgyn, NE
Russia
H. Vogel,
C. Meyer-Jacob, M. Melles, J. Brigham-Grette,
A. A. Andreev, V. Wennrich, P. E. Tarasov, and
P. Rosén
DOI:10.5194/cp-9-1467-2013
20.
Bayesian
parameter estimation and interpretation for an intermediate model of tree-ring
width
S. E. Tolwinski-Ward,
K. J. Anchukaitis, and M. N. Evans
DOI:10.5194/cp-9-1481-2013
21.
Mid-pliocene
Atlantic Meridional Overturning Circulation not unlike modern
Z.-S. Zhang,
K. H. Nisancioglu, M. A. Chandler, A. M. Haywood,
B. L. Otto-Bliesner, G. Ramstein, C. Stepanek,
A. Abe-Ouchi, W.-L. Chan, F. J. Bragg, C. Contoux,
A. M. Dolan, D. J. Hill, A. Jost, Y. Kamae,
G. Lohmann, D. J. Lunt, N. A. Rosenbloom,
L. E. Sohl, and H. Ueda
DOI:10.5194/cp-9-1495-2013
22.
Can
an Earth System Model simulate better climate change at mid-Holocene than an
AOGCM? A comparison study of MIROC-ESM and MIROC3
R. Ohgaito, T. Sueyoshi,
A. Abe-Ouchi, T. Hajima, S. Watanabe, H.-J. Kim,
A. Yamamoto, and M. Kawamiya
DOI:10.5194/cp-9-1519-2013
