Too much white space above and below equation in two column mode

Question

I'm converting a paper to two column mode (using \documentclass[twocolumn]{article}) , and one of my equations now has too much white space above and below it. See the attached image (equation (8)). How can I fix this?

I don't know how to provide a minimal working example in this case, but here is a snippet of Latex code surrounding the equation:

\subsubsection{Moreau-Yosida regularization}
\label{mySection}
Convex analysis provides an elegant way of smoothing out nondifferentiable
convex functions.
Let $f: \mathbb R^m \to \mathbb R \cup \{ \infty \}$ be closed and convex.
The Moreau-Yosida regularization of $f$ with parameter $t > 0$ is defined by
\begin{equation}
\label{myRegDef}
f^{(t)}(x) = \inf_{u \in \mathbb R^m} f(u) + \frac{1}{2t} \| u - x\|_2^2.
\end{equation}
It can be shown that $f^{(t)}:\mathbb R^m \to \mathbb R$ is a convex, \emph{differentiable}
approximation to $f$, and that the gradient of $f^{(t)}$ is given by the formula
\begin{equation}
\label{myGrad}
\nabla f^{(t)}(x) = \frac{1}{t} (x - \prox_{tf}(x)).
\end{equation}
The gradient of $f^{(t)}$ is Lipschitz continuous with Lipschitz
constant $L = 1/t$.