For example, there is a clear upward trend in overall North Atlantic
hurricane activity by virtually all metrics, over the past 30 years or so, though the cause of this is still uncertain.
Not exact matches
The Fed said
Hurricane Harvey was responsible for most of the decline
by depressing oil drilling, petroleum refining and other industrial
activity.
The rise was led
by growth in manufacturing and utilities, while mining
activities temporarily came to a standstill due to the onset of
hurricanes.
The meeting — the latest in a series designed to get feedback on the city's handling of
Hurricane Sandy recovery before an audit
by Stringer's office — will be at the Olympia
Activity Center, 1126 Olympia Blvd. from 7 to 9 p.m., according to Stringer's office.
Activity within the eyewall is closely connected to the
hurricane's overall intensity, with the vertical updraft fed
by an inward - spiraling, ocean - hugging wind whose average speed is the highest across the whole storm.
The findings across three independent research papers show that human
activity did increase the damage inflicted
by Hurricane Harvey, said Michael Wehner, a researcher at Lawrence Berkeley National Laboratory.
This influx of diversity into the reef likely helped originally build the reef, and may help replenish areas destroyed
by human
activity or
hurricanes, Bryan said.
By monitoring, understanding, and predicting these climate patterns, forecasters can often make a confident outlook of the upcoming
hurricane activity for the season as a whole.
An interesting study of
hurricanes and their impact on the bond market suggests that economic
activity generated
by the massive rebuilding effort following Irma and Harvey will likely put upward pressure on long - term interest rates.
This demand was driven in part
by the need for inspection, repair and salvage of damaged platforms and infrastructure following
hurricanes Gustav and Ike, which passed through the Gulf of Mexico in the third quarter 2008, and increased domestic and international new construction
activities, the capital budgets for many of which had already been committed prior to the end of 2008.
The new small group sailings will allow guests to take part in local impact
activities in Caribbean destinations impacted
by Hurricane Irma and
Hurricane Maria, under the direction of a small group leader.
Once tickets have been issued Virgin Atlantic shall not be liable for any failure to comply with its obligations caused
by (but not limited to) weather conditions, fire, flood, strike,
hurricane, industrial dispute, war, terrorist
activity, hostilities, political unrest, riots, civil commotion, or any other circumstances beyond the control of Virgin Atlantic.
Do you know that Goldenberg and yourself are the two scientific witnesses cited
by the german news magazine Der Spiegel yesterday under the headline that the increase in
hurricane activity «has nothing to do with global warming»?
A recent paper
by Vecchi and Soden (preprint) published in the journal Geophysical Research Letters has been widely touted in the news (and some egregiously bad editorials), and the blogosphere as suggesting that increased vertical wind shear associated with tropical circulation changes may offset any tendencies for increased
hurricane activity in the tropical Atlantic due to warming oceans.
By Rasmus Benestad & Michael Mann Just as Typhoon Nargis has reminded us of the destructive power of tropical cyclones (with its horrible death toll in Burma — around 100,000 according to the UN), a new paper by Knutson et al in the latest issue of the journal Nature Geosciences purports to project a reduction in Atlantic hurricane activity (principally the «frequency» but also integrated measures of powerfulness
By Rasmus Benestad & Michael Mann Just as Typhoon Nargis has reminded us of the destructive power of tropical cyclones (with its horrible death toll in Burma — around 100,000 according to the UN), a new paper
by Knutson et al in the latest issue of the journal Nature Geosciences purports to project a reduction in Atlantic hurricane activity (principally the «frequency» but also integrated measures of powerfulness
by Knutson et al in the latest issue of the journal Nature Geosciences purports to project a reduction in Atlantic
hurricane activity (principally the «frequency» but also integrated measures of powerfulness).
By Gray's very clearly articulated reasoning, there should have been a downturn, not the observed upturn in major Atlantic
hurricane activity over the past several decades (in the absence of other — including anthropogenic — influences on tropical Atlantic climate) if Bryden et al.'s results are correct.
«Research
by NOAA scientists Gerry Bell and Muthuvel Chelliah, currently in press with the Journal of Climate, describes the tropical multi-decadal signal and shows that it accounts for the entire inter-related set of conditions that controls
hurricane activity for decades at a time.
If we're considering the risk of
hurricane damages, and not just overall basin
activity, then the effect of increased vertical wind shear would seem to be (at least) twofold — it not only reduces potential intensity, but it also influences the steering of
hurricanes (since
hurricanes are basically steered
by the background flow plus a beta drift).
Accumulated cyclone energy (ACE) is a measure used
by the National Oceanic and Atmospheric Administration (NOAA) to express the
activity of individual tropical cyclones and entire tropical cyclone seasons, * particularly the North Atlantic
hurricane season.
As to the second the answer is probably no specifically referring to
hurricane activity mentioned
by McHugh the actual frequency of severe
hurricanes is less now than it has been in the past: Only 4 «highest category» storms have occurred in the last 10 years!
The one that is cited most frequently and authoritatively as the cause of the increasing
hurricane activity is the AMO (for example,
by William Gray, Phil Klotzbach, and Roger Pielke Jr. — see Storm frenzy is not an anomaly, but a phase, Sept 13 2005)
Is the rather definitive statement that «The increased
activity since 1995 is due to natural fluctuations (and) cycles of
hurricane activity driven
by the Atlantic Ocean itself along with the atmosphere above it and not enhanced substantially
by global warming» at all supportable?
Conversely, due to well - researched upper - atmospheric flow (e.g. vertical shear) configurations favorable to Atlantic
hurricane development and intensification, La Nina falls tend to favor very active seasons in the Atlantic (El Nino years are the converse, with must less
activity, as forecast
by Gray and NOAA for 2009).
Holland said that he recognizes that there's a potential that the study's model data might be biased
by beginning the first 10 - year period in 1995, when
hurricane activity ramped up rapidly.
In this data analysis
activity, students explore how
hurricanes extract heat energy from the ocean surface
by tracking
Hurricane Rita and sampling sea surface temperatures along its path.
Landsea, a
hurricane expert, had said that recent
hurricane activity had not been made more severe
by «global warming.»
... incomplete and misleading because it 1) omits any mention of several of the most important aspects of the potential relationships between
hurricanes and global warming, including rainfall, sea level, and storm surge; 2) leaves the impression that there is no significant connection between recent climate change caused
by human
activities and
hurricane characteristics and impacts; and 3) does not take full account of the significance of recently identified trends and variations in tropical storms in causing impacts as compared to increasing societal vulnerability.
The following table shows there have been periods of greater
hurricane activity before atmospheric CO2 increased
by any significant amount.
It was noted
by most scientists at a recent
hurricane conference that overall
hurricane activity is in General Decline.
The ability to assess longer - term trends in
hurricane activity is limited
by the quality of available data.
Now, there are several credible studies
by very established researchers that do, in fact, find that increasing trends in
hurricane activity are already evident in recent historical data, either in individual basins or globally.
The first issue, very well known
by the scientific community, is that there is large natural variability in
hurricane activity.
Detecting trends in Atlantic and eastern North Pacific
hurricane activity is challenged
by a lack of consistent historical data and limited understanding of all of the complex interactions between the atmosphere and ocean that influence
hurricanes.4, 5,6
Our common experience with
hurricanes, tornadoes thunderstorms, blizzards, floods, tsunamis, and volcanic eruptions should lead to the common sense conclusion that weather and climate are controlled
by natural laws on an enormous scale that dwarfs human
activity.
They found that averaged sea surface temperatures over the MDR are the best predictor of Atlantic cyclone
activity, followed
by global average surface temperature, with MDR warming relative to the tropics being the worst predictor of
hurricane activity (Figure 1).
But since the mid-1990s,
hurricane activity in the Atlantic has increased in both frequency and severity, according to data compiled
by the National Oceanic and Atmospheric Administration (NOAA).
The destruction caused
by natural disasters such as
Hurricane Katrina and human
activities such as mountaintop removal mining are powerful examples of how the environment and society are tightly interwoven.
Over the past 50 years there has been a strong statistical connection between tropical Atlantic sea surface temperatures and Atlantic
hurricane activity as measured
by the Power Dissipation Index (which combines storm intensity, duration, and frequency).
ABC also reported increased
hurricane activity as if it were an established scientific fact that there were now more
hurricanes and that they were caused
by global warming.
A major «scientific» study issued in the summer of 2013
by a climate researcher at the Massachusetts Institute of Technology (MIT) warned of increased
activity of killer
hurricanes because of global warming / climate change.
«The increased
activity since 1995 is due to natural fluctuations (and) cycles of
hurricane activity driven
by the Atlantic Ocean itself along with the atmosphere above it and not enhanced substantially
by global warming,» he testified.
There was also a claim, after the 2005
hurricane season in the North Atlantic, that
hurricane activity was caused
by more CO2 in the atmopshere.
A new focused effort
by a team of researchers analyzed 26 decades of
hurricane activity, covering the end of the Little Ice Age (LIA) through 2012 for the Caribbean and Gulf of Mexico water regions.
Unfortunately, despite this clear empirical evidence, the climate change and global warming doomsday alarmists attempt to portray the 2017 season as a sign of CO2 - induced climate catastrophe - and that is not being well accepted
by the actual
hurricane experts (here, here, here) who have been on the front lines of tropical cyclone
activity and impact research.
In addition, it has been well - documented that the measured global warming of about 0.5 C during the 25 - year period of 1970 - 1994 was accompanied
by a downturn in Atlantic basin
hurricane activity over this quarter - century period.»
There seem to be several mutually contradictory statements made
by climate research skeptics who focus on
hurricane activity.
Max Mayfield, director of the National
Hurricane Center in Miami: «The increased activity since 1995 is due to natural fluctuations (and) cycles of hurricane activity driven by the Atlantic Ocean itself along with the atmosphere above it and not enhanced substantially by global warming,» he t
Hurricane Center in Miami: «The increased
activity since 1995 is due to natural fluctuations (and) cycles of
hurricane activity driven by the Atlantic Ocean itself along with the atmosphere above it and not enhanced substantially by global warming,» he t
hurricane activity driven
by the Atlantic Ocean itself along with the atmosphere above it and not enhanced substantially
by global warming,» he testified.
«Our position is the recent increase in
hurricane activity is not caused
by global warming.»
I get to understand why Global Warming is not seriously discussed amongst the populace in general,
by watching many TV Meteorologists, who utterly confuse the matter, who also seem to be limited
by the range of their Doppler radars, seldom explain anything more than the latest extreme
Hurricane activity as the result of a «cycle».
If this statistical relation between tropical Atlantic SSTs and
hurricane activity is used to infer future changes in Atlantic
hurricane activity, the implications are sobering: the large increases in tropical Atlantic SSTs projected for the late 21st century would imply very substantial increases in
hurricane destructive potential — roughly a 300 % increase in the PDI
by 2100 (Figure 1a).