The phytoplankton in the sea, and the plankton food web they support, underpin the rest of the marine food chain (see: The importance of plankton). Living at the surface of the sea the plankton are particularly sensitive to changes in sea surface temperature, both directly through the effects of temperature upon their physiology, and indirectly through the effects of temperature upon the physics of the water column. As sea surface temperatures increase due to current global warming evidence is mounting that the phytoplankton are reacting to this change in their habitat, and this calls for more research to understand (see: What’s happening to the oceans’ phytoplankton?).
One new project that is specifically designed to enable you to help
add to our knowledge of the Oceans’ phytoplankton is the citizen
science Secchi Disk study www.secchidisk.org.
This study combines a 150 year-old piece of equipment invented by the
Pope’s astronomer with modern smartphone technology to help collect
data on the phytoplankton from oceans around the world. So, what is a
Secchi Disk and how does the project work, and most importantly, how
can you take part?
|Phytoplankton: These microscopic cells begin the marine food chain. They are so numerous they account for 50% of photosynthesis on Earth.|
|The Secchi Disk is a plain white, 30cm diameter disk attached to a tape measure and weighted from below. It is one of the simplest and oldest pieces of marine scientific equipment.|
Away from estuaries and coasts the main determinant of water clarity is the amount of phytoplankton in the water column. Consequently, marine biologists have used the Secchi Depth to measure phytoplankton since the Secchi Disk’s ‘invention’ in 1865. Now, with evidence to suggest the phytoplankton in the world’s oceans are changing due to climate change, and because of their important role in the marine food chain and the Earth’s carbon cycle, we need to know if, how and why they are changing. Even though we can now obtain remote estimates of phytoplankton from satellite measurements of ocean colour, in situ measurements are still fundamental and scientists still use Secchi Disks. However, there are simply too few scientists to survey the world's oceans as well as we would wish. This is where sailors, acting as citizen scientists, can help science by making and using a Secchi Disk. By collecting Secchi Depths from around the world, from now and into the indefinite future, any seafarer can help grow the database of Secchi Depth measurements to give a much bigger time series in terms of its temporal and spatial extent.
|Dr Richard R Kirby created the citizen science Secchi Disk study in 2013 to enable any seafarer to help collect data to understand the affect of climate change on the phytoplankton.|
Once the Secchi Depth is determined, you use your smartphone and the free Secchi app to obtain the GPS location and to enter the Secchi depth - a network connection isn’t required for this. The Secchi App will store the data on the phone and the Secchi Disk project receives the data as soon as network connectivity is regained. Anyone can follow the data collected on the project map. The aim of the project is to chart the seasonal and annual changes of the phytoplankton from now and into the future. It is a long-term project that carries on indefinitely. Seafarers may measure the Secchi depth at the same place regularly, or occasionally, or they may take measurements from different places as they travel. The more sailors that take part the better the coverage of the oceans, and the more remarkable and useful the citizen science Secchi Depth database will become.
I’ll now reveal my vested interest in this blog since I am the leader of the Secchi Disk project. Often, we look back and wish we had already started monitoring something about the natural world - if only we had started measuring 'x' some years ago. In terms of the phytoplankton there really is no time like the present to start growing the Secchi Depth database and this is why I created the Secchi App and this citizen science project. Since its launch in 2013 the project has gone from strength to strength. Already it is the world’s largest marine citizen science study with data from every ocean. In 2014 there was a Secchi Disk 'first' when Jimmy Cornell’s grand-daughter Nera measured a Secchi depth from the Northwest Passage, which has only recently become navigable due to global warming. Whether sailing in coastal waters or cruising across oceans, families find the project particularly useful as an educational addition to being on the water. This year small boat fishermen joined the study, as they are fully aware of the importance of understanding the phytoplankton that underpins all fisheries.
So, if you go to sea, why not take part in this study to help improve our understanding of the oceans’ phytoplankton, or alternatively, share this blog, so that more citizen scientists can find out about the project.
Dr Richard Kirby is a British plankton expert, scientist, author and speaker. Follow Richard @planktonpundit on Twitter. Richard’s book “Ocean Drifters, a secret world beneath the waves” is available on Amazon and as an iBook www.planktonpundit.org.