249 research outputs found
Modeling dimethylsulphide production in the upper ocean
Dimethylsulphide (DMS) is produced by upper ocean ecosystems and emitted to the atmosphere, where it may have an important role in climate regulation. Several attempts to quantify the role of DMS in climate change have been undertaken in modeling studies. We examine a model of biogenic DMS production and describe its endogenous dynamics and sensitivities. We extend the model to develop a one-dimensional version that more accurately resolves the important processes of the mixed layer in determining the ecosystem dynamics. Comparisons of the results of the one-dimensional model with an empirical relationship that describes the global distribution of DMS, and also with vertical profiles of DMS in the upper ocean measured at the Bermuda Atlantic Time Series, suggest that the model represents the interaction between the biological and physical processes well on local and global scales. Our analysis of the model confirms its veracity and provides insights into the important processes determining DMS concentration in the oceans
The Simplest Binary Word with Only Three Squares
We re-examine previous constructions of infinite binary words containing few
distinct squares with the goal of finding the "simplest", in a certain sense.
We exhibit several new constructions. Rather than using tedious case-based
arguments to prove that the constructions have the desired property, we rely
instead on theorem-proving software for their correctness
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