Jan 212014
 
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Enormous phytoplankton bloom off the Irish coast (NASA)

As we have pointed out, it is currently impossible to predict exactly when and where a phytoplankton bloom will occur in the ocean – one of the reasons we are developing ATOEM to detect the earliest signs of bloom formation. A paper published last July in Science by physical oceanographer Amala Mahadevan at Woods Hole Oceanographic Institution and colleagues is now profiled  in WHOI’s in-house magazine, Oceanus,  and reveals a new “trigger” for North Atlantic blooms – the giant eddies that form and trap plankton near the surface. Understanding the full life history of blooms will be a critical first step in our efforts to further enhance their ability to seaquester carbon.

“Springtime phytoplankton blooms in high and mid-latitude oceans contribute substantially to global photosynthetic fixation and export of carbon from the surface ocean, with the North Atlantic alone accounting for 20% of net global CO2 uptake.”

Mahadevan et al. (2013)

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Surprising Trigger Causes Phytoplankton Blooms in North Atlantic (WHOI)

Dec 302013
 

The Autonomous Transient Ocean Event Monitoring (ATOEM) platform concept was first presented at UUST 2013 in Portsmouth, NH this past August and has now been published in the Journal of Unmanned System Technology (JUST) Vol 1, No 3 (2013).

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AbstractA novel conceptual design is presented for a research platform for Autonomous Transient Ocean Event Monitoring (ATOEM). In simplest form, ATOEM would be an autonomous diesel-electric submarine of conventional design, but stripped of all of its requirements for human occupation and life support, and whose “torpedo” tubes would instead be loaded with a variety of AUV configurations (e.g., benthic, photic zone and midwater) capable of autonomous docking with the “mother ship”. Global deployment of a large fleet of modular, low-cost, highly manufacturable ATOEM platforms has the potential to transform oceanographic research by providing coordinated, comprehensive, time-series, spatiotemporal measurements of all key ocean properties on an unprecedented scale.

Dec 292013
 

With the recent news that the Hawaii Underwater Research Laboratory (HURL) has found the wreck of the WWII Japanese Sen-toku class “mega-sub” I-400 , I was prompted to download a copy of the book, “Operation Storm” by John J. Geoghegan.

Operation Storm

I have been intrigued by the I-400’s ever since I first learned of them – the largest diesel-elctric submarines ever built at over 400 feet, and indeed the largest submarines until the nuclear powered SSRN-586 Triton, which completed the first submerged circumnavigation in 1960. The Sen-toku class subs had a range of 37,500 miles – they could circle the globe one and a half times without refueling! In addition, they served as “motherships”, not for AUVs, but for three small seaplanes housed in a pressure proof hanger on their decks.

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The voyage of the HMS Challenger from 1872-76 is considered to be the first global marine research expedition, made possible in part by the invention of the steam powered windlass that could sample to full ocean depth for the first time. Imagine repeating this 70,000 nautical mile cruise for the 150th anniversary with an ATOEM platform matching the range and endurance of the I-400!