Thursday, January 29, 2015

Sampling the sea floor

Guy Gelfenbaum and Jackson Currie, both with the US Geological Survey, use a sediment grab off-shore of the Elwha River delta.

One of the fundamental data types used to track change in the coastal zone adjacent to the Elwha River mouth are sediment samples. Grain size data play a central role, for example, in our recently published paper documenting physical changes to the coastal environment in the first two years after dam removal.

Yesterday, associated with regular topography/bathymetry surveys of the Elwha River delta, I went out to help dredge up yet more dirt from the ocean floor. Check it out:

The day turned out to be pretty nice, with beautiful water conditions, so all in all not a bad way to spend a day...plus every sample we pulled up added a bit to our understanding of how sediment is moving around in the coastal environment. On top of it, we got to observe a veritable feeding frenzy occurring right off the river mouth, with possibly ~100 Harbor seal and California sea lions feeding (perhaps on some of the fish species observed just a few days earlier?) just a few feet outside the river mouth.

Tuesday, January 6, 2015

A Fall Warm Water Pulse in the Strait of Juan de Fuca

Students from this year's oceanography class construct their mooring

For the past three years my oceanography class at Peninsula College has built and deployed moorings that measure, amongst other things, water temperature around City Pier in Port Angeles Harbor. The deployments are always about a month long, and always take place around the same time...usually mid-October to mid-November.

HOBO pendants, the data collection workhorse for my class's moorings

The moorings are built around HOBO pendants, which are placed to measure both surface water temperature, and "deep" water temperature...up to about 25 feet deep in this part of the Harbor.

Mooring deployment locations around City Pier

Here is the interesting observation from this year: We captured a really dramatic spike in water temperature this fall. I'm going to show data from the deepest water HOBO available at Station D, off the very end of the Pier, simply to illustrate that this wasn't just a surface warming phenomenon. This HOBO sits at a depth of about 20 feet relative to MLLW. Here are the data from 2012 and 2013. You will note that the 2012 deployment was only 2 weeks long:

In 2014 here was the pattern (the green line). Hopefully the difference is obvious:

But in reality, given the short record in 2012, we are working with only two years of data here - not ideal. So lets turn to surface water temperature measures from the Port Angeles tide gauge to try to get a sense of how anomalous this might be. First off, here is the typical annual pattern, based on data since 1998:

This takes water temperature data from each year (hourly observations) and plots them against the day of the year. I've colored all these years the same - the key take away is that in the fall the typical pattern is to see a decline in water temperature as winter sets in.

2013 was a bit different, in that there was a one-week pulse of relatively warm water recorded in the harbor in October (around Day 275; and actually one in July as well around day 180):

At the time I thought these two pulses were very interesting (and still do). But this year's fall pulse, the one we picked up with our class HOBO's, lasted much longer and was warmer (the red line between about Day 280 and 330):

That bulge between about Day 280 and 330 is warmer, by about 2 degrees Celsius, than the "usual" warm temperature at that time of year. The only other year that exceeds it? The 1997 winter, during a strong El Nino (shown here in purple):

Here, the pulse of warm water in the harbor occurred a bit earlier in the fall, but looks very similar in terms of its magnitude and duration. The interesting thing is that NOAA currently has us on an El Nino Watch, and suggests that El Nino conditions still aren't present. Interestingly, though, they note that much of the Pacific is warmer than average, but its the atmospheric El Nino conditions that haven't materialized. No matter which way you cut it though, no once is calling this a strong El Nino like the one that materialized in Spring 1997.

Another way to look at this is to look at the monthly average temperature from the Port Angeles tide station:

So in this case the thinner line is the monthly average temperature - you can see the seasonal pattern in there quite clearly. The green thicker line is the anomoly from the average monthly temperature, in degrees celsius, and November 2014 is the peak in that green line just shy of 2015. It is the highest temperature anomoly since the 1997-1998 El Nino.

So what is going on? I'm not really sure...and would love to figure it out. Contact me if you can help me understand.

Friday, December 26, 2014

Guest Blogging!

Hollywood Beach (foreground) and the Fiero Marine Life Center (background). Photo courtesy of http://portangelesdailyphoto.blogspot.com/

So it surely appears that I've been allowing my own blog to lapse...this is my first post in the month of December!

But I've been guest-blogging up a storm! As part of a new effort to post monthly "Marine Science Topics of the Month" on the Feiro Marine Life Center (I serve on their board and also chair the Education and Research committee for the organization) blog, I authored two pieces in the past month or so: One on some observations of octopus at the mouth of the Elwha River, and another on the seasonal pattern of beach wrack on Hollywood Beach, adjacent to the marine life center. Enjoy!

Tuesday, November 25, 2014

The night-time intertidal at Freshwater Bay

A juvenile Octopus doeflini found foraging in the intertidal by one of my Oceanography class students

This is the third year in a row that I've offered a special night-time tide-pooling field trip to the students from my Peninsula College Introduction to Oceanography class. We had a great trip last night to Freshwater Bay, slipping it in between rain squalls. The wonderful thing about the winter night-time low tides is that you can see so much more, since organisms are not stressed by high temperatures and/or dessication. I was struck by two things:

1) Octopi! We saw two...the juvenile in the video above, which was out and about in the lower intertidal, and this one sheltering under a boulder:

2) The number and diversity of juveniles invertebrates and eggs that we observed. For this time of year it struck me as pretty out there. We say juvenile Hexactis, sharp-nosed crab, mollusc eggs of some kind, and this (dead) female Red Rock crab carrying an egg mass:

A few other images from the night:

The gunnels were plentiful...but I'm horrible at ID in the Pholidae family, so I'm not even going to try...

Similarly...

One of at least three Keyhole Limpets (Diadora aspera) we saw - all of them out in places they would never be in the summer during a low-tide. On this one we also were able to observe the commensal scale worm Arctonoe vittata

My favorite! The Northern Clingfish (Gobiesox maeandricus). Check out this interesting (and mildly disturbing) piece on its unique abilities.

and last, but not least, a great profusion of porcelain crabs (Petrolisthes sp.)

Friday, November 21, 2014

Marine Debris Museum

I had an opportunity this week to visit John Andersen's incredible Marine Debris Museum in Forks, Washington. John is in the process of upgrading his museum and curating his huge collection, and plans to open this upcoming summer under general hours (currently he will show the collection via prior arrangement). Here are a few photos...I am sure you will agree with me that for any Washington-based coast nerd out there this museum is a required pilgrimage.

Tuesday, October 28, 2014

Daily averaging of coastal time lapse photos

Time lapse of the toe of the Ledgewood Slide on Whidbey Island. Photos collected every 30 minutes between April and June 2013

I've posted numerous times about the value of photography for understanding coastal systems, and in particular like time lapse photography. Time lapses of the coast are invariably interesting and contain lots of information, but one thing that has always bothered me about time lapse on the coast, though, are the problems associated with both changing lighting throughout the day, as well as changing water level. Both make it very hard for the eye to track the morphological change that is often my interest in collecting the photos in the first place.

The video above, composed of time lapse photos collected every 30 minutes, provides a great example. The interest here was in understanding when, and how much the toe of a coastal bluff failure on Whidbey Island, eroded over the year after the slide. In this case there is observable change, but its hard to track with the eye due to changing light and water level. Here is another example:

Time lapse of Hollywood Beach, Port Angeles, composed of photos collected every hour between December 2013 and June 2014

In this case I was interested in understanding the timing of the on-shore movement of the big piles of Ulva lactuca that appear on Hollywood Beach (in Port Angeles, Washington) every winter. Here, the problem isn't so much lighting, but the length of the video is a bit imposing.

So I took a cue from Andy Ritchie at Olympic National Park, who came up with the idea of AVERAGING all of the time lapse photos taken over the course of a day to create a series of much-viewed time lapses of the removal of dams on the Elwha River. Of course! By averaging all of the time lapse photos collected over a day the variations in light and water level are largely eliminated, and the coastal change of interest is highlighted. Here are the same two time-lapses shown above:

Daily average time-lapse of toe erosion on the Ledgewood Slide, Whibey Island

Daily average time-lapse of Hollywood Beach, Port Angeles, during the winter of 2013-2014 showing the on-shore movement of pulses of Ulva lactuca

The downside in my mind, is that some of the daily average photos are a bit blurry - probably due to wind causing the camera to move ever so slightly. A better camera mount should solve this problem, but often times my camera placements are temporary and utilize whatever structure I can find on the beach. Despite this problem, though, I think the result works. Any thoughts from readers would be appreciated.

Tuesday, September 23, 2014

Observations from Rialto Beach and the International Coast Clean-up

McHenry relaxing at the post-cleanup barbecue hosted by the Surfrider Foundation

Its been a good long while since I've participated in a beach clean-up and actually cleaned the beach. For the past several years I've participated in the April Olympic Coast Clean-up (see this and this), for example, but since our registration station is up at the Three Rivers fire station, I sometimes don't even get to lay eyes on the beach for the whole event.

Christine and McHenry working the backshore at Rialto Beach, ONP

So it was a delight to actually get to work a beach for this past weekend's International Coast Clean-up, organized on the Olympic coast by Washington CoastSavers. Since my family was coming along, and we are distance-limited by our two young sons, we opted to head to Rialto Beach, which includes amongst its many positive attributes easy access. I knew from hanging out at Rialto Beach that it is generally not that "dirty", and anecdotal reports from the likes of Dr. Steve Fradkin (who spends a good bit of time on the beaches of Olympic National Park) suggested that it looked pretty clean. But I was still quite curious as to what we would find there. Additionally, the high tide during the clean-up forced us on to the upper beach and backshore and I was particularly interested in poking about in and around the vegetation line to see what we would find.

Our haul

In the end, after about 1.5 hours and covering about 1/2 mile, we walked off the beach with an estimated 2 kilos of debris, which I roughly estimated (based on the type of debris and its "look") to be half ocean-derived (i.e. floated on to the beach from elsewhere) and about half derived from visitors to the beach. To put it into the context of the debris "production" rate I estimated after the April 2012 Olympic Coast Clean-up for Rialto Beach, it is on the low end (coming out to about 2.2 pounds/person/mile).

By count, this was easily the most common debris type we found at Rialto...small, friable bits of styrofoam

We ended up spending most of our time cleaning the scattering of styrofoam on the upper beach. I've heard some express anxiety about the ecological impact that small, friable styrofoam chunks have on the intertidal ecosystem, but I've yet to really dig into the peer-reviewed literature addressing the topic directly (if you know of any references please send them my way). This beach clean-up session once more piqued my interest in that question.

Checking out the ocean during the beach clean-up