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Airguns infect summer soundscapes in remote polar Atlantic Ocean

Effects of Noise on Wildlife, Ocean, Ocean energy, Seismic Surveys No Comments »

AEI lay summary of:
Holger Klinck, Sharon L. Nieukirk, David K. Mellinger, Karolin Klinck, Haruyoshi Matsumoto, and Robert P. Dziak. Seasonal presence of cetaceans and ambient noise levels in polar waters of the North Atlantic. J. Acoust. Soc. Am. EL176, 132 (3), September 2012.

I somehow missed this study when it was published a couple years ago, but the findings are so striking that I can’t resist turning back the clock to cover it.  Researchers from Oregon State University and NOAA’s Pacific Marine Environmental Laboratory analyzed data from two hydrophones deployed for a year in some of the most remote areas of the very northern Atlantic Ocean, and found seismic survey airgun sounds to be a dominant presence, audible for 95% of each day for five months a year (and over half the hours for two more months).

Klinck map and 3 spect350Luckily for the fin whales who are the most populous marine mammal in these remote waters east of northern Greenland, they tend to show up toward the end of the summer airgun season, and concentrate their polar activity in the winter, when the airguns go silent.  But blue whales and a relatively few sperm whales like to be there in late summer, and must co-exist with the steady rumble of airgun sounds, which increase the ambient sound levels by an average of 5-10dB, and up to 20dB.  By contrast, the roar of storm-driven winter waves adds up to 12dB, and the calls of thousands of fin whales add up to 10dB.

The authors don’t speculate about the location of the seismic surveys being heard in the region, which lies well north of the Arctic Circle (the two sites are between 75 and 80 degrees north latitude; the Arctic Circle is at 66.5).  But it’s a straight, if rather long, shot from the North Sea oil fields between the UK and Scandinavia, with Norway’s offshore arctic developments a bit closer. I suspect that the offshore concentrations of red between Norway and the study sites are likely active oil fields, with heightened airgun activity; the dark red North Sea hosts one of the world’s highest concentrations of ongoing seismic surveys.

Shipping global graphic WEB Polar Atlantic CROP copy

What’s especially discouraging about these findings is that this is one of the increasingly rare parts of the world’s oceans that is largely spared the scourge of shipping noise.  The more northern site lies close to a minor shipping lane between Norway and its remote arctic island outposts, but compared to the din of ships in most of the temperate latitudes (where shipping noise has roughly doubled in intensity each decade since the 1950s), this should be—or couldbe an acoustic refuge. The map to the right shows the study areas, on the sparse fringes of the red cloud of global shipping routes. (Ed. note: Fish, which are not as wide-ranging as whales, and often use low-frequency sounds, are also likely affected by the increased background noise caused by airguns.)

The whales who visit seasonally seem to be putting up with the additional noise from seismic surveys; hundreds of blue whales are heard during 60-80% of hours in August and September, even as airguns continue to be heard nearly 100% of hours; the newly-arriving fin whales are heard close to half the time in those months, increasing to 70-80% of hours as their numbers climb to an estimated 6000 in mid-winter. Of course, at close range the whale calls are much louder than the distant airguns; but the steady hum of airguns at 5-10dB above what would otherwise be the background sound level can make it difficult for whales to hear their brethren across the dozens or hundreds of miles that they might otherwise communicate. As the authors note: “(D)uring the summer months. . . reverberation effects associated with the propagation of airgun signals often caused a continuous series of transient sounds.” 

The authors note that recordings made in the early 1970s show winter-time sound levels similar to those recorded in this study; that study, however, did not find the summertime increase that is now associated with the distant seismic surveys.

Navy (mostly) prevails in LFA lawsuit

Effects of Noise on Wildlife, Ocean, Sonar No Comments »

Eighteen months after a lawsuit challenged the latest 5-year authorization for the US Navy’s SURTASS-LFA low-frequency active sonar system, Federal Judge Elizabeth Laporte ruled in the Navy’s favor on nearly all counts.  And last week, the Navy agreed to do a Supplemental Environmental Impact statement that will address the key point on which she found in favor of the plaintiffs.

As reported here earlier, the Navy was authorized to deploy LFA sonar on four ships, though initially only two were so equipped, both generally deployed in the western Pacific, monitoring North Korean and Chinese vessels (in 2009, their presence spurred a multi-month spat with China). The legal challenge addressed here, filed in late 2012 by the NRDC and several allies, targeted both the Navy’s EIS and the National Marine Fisheries Service’s five-year incidental take regulations.  In her ruling last March, Judge Laporte sided with the Navy and NMFS on most counts.  Most centrally, Judge Laporte ruled that the relatively limited set of Offshore Biologically Important Areas (OBIAs) that should be avoided by LFA sonar was justified by the science, and was not, to use the legal-standard terms, arbitrary and capricious (by contrast, NRDC charged that the 22 OBIAs were “literally a drop in a bucket” within the 50% of the earth’s oceans open to LFAS deployment). In addition, several specific ways in which the Navy and NMFS limited OBIA protections were ruled valid, including using only seasonal OBIAs to protect sperm whales, and omitting harbor porpoises and beaked whales from OBIA protections because the sonar’s frequencies do not overlap their hearing ranges.  And, in several areas, Laporte also rejected claims that the Navy failed to use the most recent available evidence (this is a new angle of attack, one that Laporte showed some openness to in a related suit on the Navy’s mid-frequency active sonar plans).  In addition, she ruled that the Navy and NMFS did not fail to consider alternatives to LFAS, and did not fail to “take a hard look” at effects on non-marine-mammal species such as fish.

UPDATE, July 2016: A federal appeals court has overturned much of this ruling, suggesting that the NMFS failed to meet the “least practicable impact” standard by choosing to include only those 22 OBIAs as exclusion zones.  See details here.

However, in one area, Laporte found that the Navy’s EIS fell short: it failed to update its stock estimates for bottlenose dolphins around Hawaii based on a new study (released after the initial impact assessments were done, but before completion of the final EIS) that showed more bottlenose dolphins in waters around Hawaii than previously estimated (two exercises with the Pacific LFA ships occur near Hawaii).  Thus, the Navy’s impact estimates, using the old numbers, are too low.  In a final agreement approved by Laporte in late May, the Navy agreed to re-run its estimates in a Supplemental Environmental Impact Statement, to be completed by February 2015; if past is prologue, the Navy will run its new numbers and find that the impact is still negligible.  However, the LFA plan aims to impact no more than 12% of any regional stock of each species, and it may not yet be clear whether the new numbers will push impacts above that threshold (the earlier estimates peaked at 6% of the stock of Hawaiian bottlenose dolphins in offshore pelagic waters).

If that’s not enough legal reporting for ya, then click over to this post from January 2014 detailing the most recent round of lawsuits, filed against new 5-year permits for Navy training areas in US offshore waters.