HADSST2 reaches into areas with seasonal sea ice, but Kaplan does not, meaning there is very little Arctic and Southern
Ocean SST data in the Kaplan dataset.
Yes,
the ocean SST is tricky because you need all the surface and deep currents just right to get it, and I am fairly sure they are not there yet.
The atmosphere can not warm / cool more than
the ocean SST changes, so it should also respond more strongly than the atmospheric response.
The second line of evidence is how stable Tmax is, it's really flat, most years it's 0.0 something, the Tmax average of 119 million records for the world is 0.00193, so Tmax is flat, Tmin however flutters around, it's not flat and the changes are regional, they don't happen at the same time in different places, like
the ocean SST's change, and the downwind surfaces detect it.
Using
ocean SST under the sea ice would certainly make a difference, but that wouldn't be clever.
My attempts to determine the ratios and differences between the observed ocean air versus
ocean SST temperature trends to compare with the model results were limited by the sparseness of the observed data.
The new draft refrains from the word «elusive», but concedes the over-estimate, noting that much of the over-estimate arises from an over-estimate of tropical
ocean SST propagated upwards.
I have found that this same relationship applies when the first difference of the global land trends are correlated to the land trend minus
the ocean SST trend.
Additional work by Ummenhofer (2008) has shown changes in the Indian
Ocean SST may provide another forcing to SWAC.
The global
ocean SST for June 2009 was the warmest on record, 0.59 °C (1.06 °F) above the 20th century average of 16.4 °C (61.5 °F).
Note: for reference, the global
ocean SST temperature trend (C per decade) for 1979 - 2005 was reported by the IPCC to be 0.134.
Wajsowicz, R.C., 2005b: Potential predictability of tropical Indian
Ocean SST Anomalies.
The 5 to 7 year fluctuations are most likely ENSO related, though ENSO would be better replaced with tropical
ocean SST imo.
The PDO could be the main driver which when further supported by low EUV and the following pressure pattern changes (NAO, AAO etc) takes
the ocean SST's to their lowest points.
In open
Ocean SST tracks variations in Air temperature, but this is not the case near the transitional and mobile ice «boundaries».
Max The lag between solar cycles and
the ocean SST (Atlantic and Pacific) is ~ 15 years.
Max (second attempt) The lag between solar cycles and
the ocean SST (Atlantic and Pacific) is ~ 15 years.
We have however had record
ocean SST's and heat content globally.
The tropical volcanoes would have the largest impact on Ocean Heat Uptake and tropical
ocean SST which takes 5 to 10 years to work its way through the climate system.
And since the Southern
Ocean SST anomaly trend over this period is negative, its interaction with the Southern Hemisphere oceans lowers the trend of the dataset.
Over a short - enough time frame,
the ocean SST distribution may anchor atmospheric weather patterns, but over longer periods, there is important two - way interaction (the components are more strongly coupled).
However, atmospheric CO2 content plays an important internal feedback role.Orbital - scale variability in CO2 concentrations over the last several hundred thousand years covaries (Figure 5.3) with variability in proxy records including reconstructions of global ice volume (Lisiecki and Raymo, 2005), climatic conditions in central Asia (Prokopenko et al., 2006), tropical (Herbert et al., 2010) and Southern
Ocean SST (Pahnke et al., 2003; Lang and Wolff, 2011), Antarctic temperature (Parrenin et al., 2013), deep - ocean temperature (Elder eld et al., 2010), biogeochemical conditions in the Northet al., 2008).
This last remark does not depend on the Indian
Ocean SSTs being a good proxy for global temperature.
The drought and famine in East Africa was also related to the high Indian
Ocean SSTs (Williams and Funk 2011).
And it is known that the southern polar regions «see - saws» with the northern — so when the north polar is on the up cycle — the south polar in on a downer (Bob Tisdale's graph of the southern
ocean SSTs shows this clearly for the «global warming» period of 1980 - 2005 — and the Peninsula Region just catches a flow - in from warmer seas to the north).
These changes in tropical Pacific
Ocean SSTs over the past millennium have often been associated with internal variability of the ocean - atmosphere system [19,27,53,54] that may not be accurately represented in current climate models.
Our study stresses the importance of those internal connections between tropical Pacific
Ocean SSTs, the ENSO system, and the American Southwest hydroclimatic conditions and supports the contention that: (1) internal variability of the ocean - atmosphere system may not be accurately represented in current global climate models, and (2) enhanced variability as a result of these stochastic events should be further considered.
2014 was not a record for global land areas [4th only] 2014 was not a record for the entire land oceans for Southern Hemisphere (2nd only) It was a record only for Northern Hemisphere
oceans SST anomalies and only the North Pacific showed extra warming mostly as shown on Bob Tisdale's monthly reports of Ocean SST's The North Pacific SST has risen steadily from an anomaly of about 0.3 C in 2010 to almost 0.7 C in 2014.
McGregor (2015) supplemental the OCEANS2K study, in table S7 says that
the oceans SST cooled 0.41 C / 1000 yrs from (801-1800 CE) and 0.31 C from (1 - 2000 CE).
eadler2, In case you get over your approximation phobia, here those silly trends from the Oppo IPWP with BEST land and the NH / SH
ocean SSTs
That fossil fuel emissions would likely have been kept in check, either by the 1920's -30's cooling
ocean SSTs globally, there had to be a different process at work.
Not exact matches
The changes in MHW properties (Fig. 1b, e, h, k) also clearly indicate signatures of a negative PDO pattern (
SST decreases in the central and eastern tropical Pacific and in the eastern extra tropical Pacific
Ocean; Supplementary Fig. 2A) and of a positive AMO pattern (
SST increases in the North Atlantic particularly away from the mid-latitudes; Supplementary Fig. 2B).
SST in parts of the
ocean, e.g., the Southern Ocean, the South Indian Ocean, and much of the Pacific Ocean, were sparsely observed prior to the mid-twentieth cen
ocean, e.g., the Southern
Ocean, the South Indian Ocean, and much of the Pacific Ocean, were sparsely observed prior to the mid-twentieth cen
Ocean, the South Indian
Ocean, and much of the Pacific Ocean, were sparsely observed prior to the mid-twentieth cen
Ocean, and much of the Pacific
Ocean, were sparsely observed prior to the mid-twentieth cen
Ocean, were sparsely observed prior to the mid-twentieth century.
Shifts in internal temperature variability, measured through
SST variance and skewness, are also occurring and contribute to much of the MHW trends observed over the remainder of the global
ocean, particularly for MHW duration and intensity.
Hotspots of high intensity occurred in regions of large
SST variability including the five western boundary current extension regions (+2 — 5 °C), the central and eastern equatorial Pacific
Ocean (+1 — 4 °C) and eastern boundary current regions (+1 — 3 °C).
Warming has occurred in both land and
ocean domains, and in both sea surface temperature (
SST) and nighttime marine air temperature over the
oceans.
If we want to know why
SST is changing at observed rates (long term), or why it takes so long for changes in atmospheric dynamics to register fully in the
ocean, OHC is critical, but if we simply want to quantify the change, the direct measurements are more appropriate.
Reversal of three global atmospheric fields linking changes in
SST anomalies in the Pacific, Atlantic and Indian
oceans at tropical latitudes and midlatitudes
However, if one downweights these two events (either by eliminating or, as in Cane et al» 97, using a «robust» trend), then an argument can be made for a long - term pattern which is in some respects more «La Nina» - like, i.e. little warming in the eastern and central equatorial Pacific, and far more warming in the western equatorial Pacific and Indian
oceans, associated with a strengthening, not weakening, of the negative equatorial Pacific zonal
SST gradient.
Total column water vapour has increased over the global
oceans by 1.2 ± 0.3 % per decade from 1988 to 2004, consistent in pattern and amount with changes in
SST and a fairly constant relative humidity.
The former is likely to overestimate the true global SAT trend (since the
oceans do not warm as fast as the land), while the latter may underestimate the true trend, since the SAT over the
ocean is predicted to rise at a slightly higher rate than the
SST.
(Bottom left) Multi-model average
SST change for LGM PMIP - 2 simulations by five AOGCMs (Community Climate System Model (CCSM), Flexible Global
Ocean - Atmosphere - Land System (FGOALS), Hadley Centre Coupled Model (HadCM), Institut Pierre Simon Laplace Climate System Model (IPSL - CM), Model for Interdisciplinary Research on Climate (MIROC)-RRB-.
Over the period 1984 — 2006 the global changes are 0.28 °C in
SST and − 9.1 W m − 2 in Q, giving an effective air — sea coupling coefficient of − 32 W m − 2 °C − 1... [D] iminished
ocean cooling due to vertical
ocean processes played an important role in sustaining the observed positive trend in global
SST from 1984 through 2006, despite the decrease in global surface heat flux.
http://journals.ametsoc.org/doi/abs/10.1175/JCLI-D-11-00148.1 Global satellite observations show the sea surface temperature (
SST) increasing since the 1970s in all
ocean basins, while the net air — sea heat flux Q decreases.
Drought variations in the study area significantly correlated with sea surface temperatures (
SSTs) in North Pacific
Ocean, suggesting a possible connection of regional hydroclimatic variations to the Pacific Decadal Oscillation (PDO).
However, comparison of the global, annual mean time series of near - surface temperature (approximately 0 to 5 m depth) from this analysis and the corresponding
SST series based on a subset of the International Comprehensive
Ocean - Atmosphere Data Set (ICOADS) database (approximately 134 million
SST observations; Smith and Reynolds, 2003 and additional data) shows a high correlation (r = 0.96) for the period 1955 to 2005.
Nesting activity across species and
ocean basins has thus been linked to sea surface temperatures (
SST) in the months preceding nesting [21], [22], [23].
Gordon, C., et al., 2000: The simulation of
SST, sea ice extents and
ocean heat transports in a version of the Hadley Centre coupled model without flux adjustments.
Note that the values are the mean changes of SAT over land, and
SST over
ocean.
You're right 2.2 K (grid points where there is paleo - data) refers to the
SST change over the
ocean and SAT over land, and 3 K refers to the global SAT change.