Index: /issm/trunk-jpl/src/c/analyses/AdjointBalancethickness2Analysis.cpp
===================================================================
--- /issm/trunk-jpl/src/c/analyses/AdjointBalancethickness2Analysis.cpp	(revision 18568)
+++ /issm/trunk-jpl/src/c/analyses/AdjointBalancethickness2Analysis.cpp	(revision 18569)
@@ -137,5 +137,6 @@
 	/*Deal with second term*/
 	switch(control_type){
-		case BalancethicknessOmegaEnum:  GradientJOmega(element,gradient,control_index); break;
+		case BalancethicknessOmegaEnum:           GradientJOmega(element,gradient,control_index); break;
+		case BalancethicknessThickeningRateEnum:  GradientJdHdt( element,gradient,control_index); break;
 		default: _error_("control type not supported yet: " << EnumToStringx(control_type));
 	}
@@ -192,4 +193,28 @@
 	delete gauss;
 }/*}}}*/
+void AdjointBalancethickness2Analysis::GradientJdHdt(Element* element,Vector<IssmDouble>* gradient,int control_index){/*{{{*/
+
+	/*Fetch number of vertices for this finite element*/
+	int numvertices = element->GetNumberOfVertices();
+
+	/*Initialize some vectors*/
+	IssmDouble* ge            = xNewZeroInit<IssmDouble>(numvertices);
+	IssmDouble* lambda        = xNew<IssmDouble>(numvertices);
+	int*        vertexpidlist = xNew<int>(numvertices);
+
+	/*Retrieve all inputs we will be needing: */
+	element->GradientIndexing(&vertexpidlist[0],control_index);
+	element->GetInputListOnVertices(lambda,AdjointEnum);
+	for(int i=0;i<numvertices;i++){
+		ge[i]= - lambda[i];
+		_assert_(!xIsNan<IssmDouble>(ge[i]));
+	}
+	gradient->SetValues(numvertices,vertexpidlist,ge,INS_VAL);
+
+	/*Clean up and return*/
+	xDelete<IssmDouble>(ge);
+	xDelete<IssmDouble>(lambda);
+	xDelete<int>(vertexpidlist);
+}/*}}}*/
 void AdjointBalancethickness2Analysis::InputUpdateFromSolution(IssmDouble* solution,Element* element){/*{{{*/
 	element->InputUpdateFromSolutionOneDof(solution,AdjointEnum);
Index: /issm/trunk-jpl/src/c/analyses/AdjointBalancethickness2Analysis.h
===================================================================
--- /issm/trunk-jpl/src/c/analyses/AdjointBalancethickness2Analysis.h	(revision 18568)
+++ /issm/trunk-jpl/src/c/analyses/AdjointBalancethickness2Analysis.h	(revision 18569)
@@ -29,4 +29,5 @@
 		void GradientJ(Vector<IssmDouble>* gradient,Element* element,int control_type,int control_index);
 		void GradientJOmega(Element* element,Vector<IssmDouble>* gradient,int control_index);
+		void GradientJdHdt(Element* element,Vector<IssmDouble>* gradient,int control_index);
 		void InputUpdateFromSolution(IssmDouble* solution,Element* element);
 		void UpdateConstraints(FemModel* femmodel);